Okay, so I need to figure out how many days are there between December 5th, 2025, and July 20th, 2025. Wait, hold on, the dates given are in dd/mm/yyyy format, right? Let me confirm that first. The user wrote "12/5/2025" which would be day 12, month 5 (May), year 2025 if using European date format where it's DD/MM/YYYY. Similarly, 20/7/2025 is July 20th, 2025. Wait a second, but the first date is December 5th? No, wait: If the dates are in dd/mm/yyyy format, then 12/5 would be May 12th (since day comes before month). But the user wrote "between 12/5/2025 and 20/7/2025", so that's from May 12 to July 20. Wait, but then why did they mention December? Because if it was in US format (mm/dd/yyyy), then 12/5 would be December 5th, but the user specified "dd/mm/yy" at the end of their question, so that's definitely DD/MM/YYYY. So first date is May 12, 2025. Second date is July 20, 2025. So I need to calculate days between these two dates. But wait, let me check if it's inclusive or exclusive? The user says "between", which could be ambiguous, but usually when people ask for the number of days between two dates, they mean the difference excluding both end points. However, sometimes it might include one or both ends. Hmm. Let me note that down and see. But let me first just calculate the total days from May 12 to July 20 inclusive or exclusive? Maybe I need to check by counting months step by step. So starting with May 12th to May 31st: How many days is that? May has 31 days. So from the 12th to the 31st, it's 31 - 12 = 19 days? Wait no, because if you include both the start and end dates, but actually, when counting between two dates exclusive of the endpoints, you need to be careful. Alternatively, maybe I should calculate total days from May 12th up until July 20th. So perhaps using a formula or breaking down each month. First, let's consider that we're going from May 5 (wait no) May 12th, 2025 to July 20th, 2025. So first, how many days are left in May after the 12th? Since May has 31 days. From May 12 to May 31 inclusive: that would be (31 - 12) + 1 = 20 days. Wait, because if you take from the 12th to the 13th, it's two days but difference is one day. So depending on whether we include both dates or not. But let me think again: If I want total number of days between May 12 and July 20 inclusive, that would be different than exclusive. Since the user says "between", maybe they just mean the duration in days from when you start to finish, so if today is date A and tomorrow is date B, then there's one day between them (the period). But sometimes people might consider the number of calendar days separating two dates. Alternatively, perhaps I should compute it as follows: Take July 20th minus May 12th. Let me think about using a year with known days or checking each month. First, from May 12 to June 12: that's exactly one month (May), which is 31 days? Wait no, if you go from the same day in next month, but here we are going from May 12th to July 20th. So maybe: From May 12 to May 31: as above, let me compute that again. If today is May 12 and tomorrow is May 13, then days between them exclusive would be one day (May 13), but inclusive it's two. But the problem says "between", which usually excludes both dates. Wait, but if you have a time period from date A to date B, how many days are in that interval? For example, from May 5th to May 7th: is that three days (including start and end), or just two days between? This can be confusing. Alternatively, maybe I should use the formula for calculating number of days between dates. If we consider both dates as day counts since a certain date, like January 1st, then subtract them. But to do that manually without a calendar might be error-prone. But let's try step by step: First, May has 31 days. So from May 12th to June 12th is exactly one month (assuming no leap year complications). Wait but we need the exact number of days between them. From May 12th to June 12th: that's 31 - 12 = 19 days left in May, then + 12 days in June? No. If you go from May 12 to May 31 is (31-12) = 19 days after the 12th? Wait no: for example, if today is May 1st and tomorrow is May 2nd, that's one day difference. Wait perhaps an easier way: The number of days between date A and date B can be calculated by taking (dateB - dateA). But to do this manually, need to break into months. Let me think about the dates again. Start: May 12th, end: July 20th, both in 2025. So let's count each month: First, from May 12 to June 12 is one month (May), which has 31 days. Wait no: if I take the time between May 12 and June 12 inclusive? No. If you start on May 12th, then adding a day would be May 13th, so from May 12 to June 12 is exactly one month (May has 31 days). Let's check: the number of days between May 12 and June 12 inclusive? Wait if I go from May 12 to June 12: Number of days in May after the 12th, including the 12th? If you include both start and end dates. Wait no, perhaps it's better to calculate total number of days between two dates by adding up each month. So let me do this step by step: From May 12 to July 20: that can be broken into three parts: Days remaining in May after the 12th (including the 12th? or excluding?) Wait, if you want total days from May 12 to July 20 inclusive, it's: May has 31 days. So from May 12 to May 31: that is 31 - 12 + 1 = 20 days (including both the 12th and 31st). Then June has 30 days. July has up to July 20, so 20 days. Total would be 20 + 30 + 20 = 70 days. But this is if including both start and end dates. But the question says "between", which usually doesn't include either of them. For example, between May 1st (exclusive) and May 4th (exclusive) would be two days: May 2nd and 3rd. So depending on interpretation. Alternatively, sometimes people count inclusive. Hmm. Wait but in some contexts, "how many days are between date A and date B" can mean the difference where you subtract one day from the total when counting exclusive dates. But since there is ambiguity here, maybe I need to check both possibilities or see if 2025 has any leap years which might affect February? But in this case, we're dealing with May through July. So no effect of leap year on those months. Wait 2025: Is that a leap year? Leap years are divisible by 4 but not by 100 unless also by 400. 2025 ÷ 4 = 506.25, so no. So it's not a leap year. Therefore February has 28 days. But our months of interest here: May (31), June (30), July (31). No issues there. So going back to the original problem: If I calculate from May 12th inclusive up until and including July 20, that would be as above: 20 + 30 + 20 = 70 days. But if we are excluding both start and end dates (i.e., only counting the days in between), then it's total of 70 - 2 = 68 days? Wait no. Because inclusive is 70, so exclusive would be subtracting one day from each side? So for example: If you have two days: Day A and Day B (with A < B). The number of days between them inclusive is (B - A +1), the number of days in between excluding both ends would be (B - A -1). So if total days inclusive are 70, then exclusive is 68. But maybe that's not necessary here. Since the user didn't specify whether to include or exclude the dates, but given the phrasing "between", it might refer to the number of calendar days in between, which would be exclusive. However, sometimes people say "how many days are there between today and tomorrow" as one day. But perhaps safest way is to calculate total difference by using a date calculator approach or formula. Alternatively, let's use another method: Let me compute each month: First, from May 12th to June 12th: that's exactly one month. Since May has 31 days, the number of days between these dates inclusive is (June 12 - May 12 + 1)? No. Wait actually, if you take two specific dates and count how many days are in between them, including both start and end, it's dateB minus dateA plus one. For example: from day 5 to day 7 is 3 days (5th,6th,7th). So difference of 2 days but number of inclusive days is 3. But the formula for exclusive would be subtract two. However, given that I need to know what the user wants. Since they didn't specify, maybe best practice in such problems is to present both or check via a method. Alternatively, perhaps use another approach: let's convert each date into Julian day numbers and compute their difference. But since I don't remember all those numbers, I can calculate them manually step by step. Let me consider January 1st, 2025 as day zero? No. Alternatively, think about the total number of days from a known starting point to May 12th, then same for July 20th and subtract. But without referring to an actual calendar or formula sheet, this might be complex manually. Alternative approach: First, let's count the number of full months between May 12 and July 20. From May 12 to June 12 is one month (May), which has 31 days. Then from June 12 to July 12 is another month (June) with 30 days. So that's two months: 31 + 30 = 61 days. Then we have remaining time in July up until the 20th, so adding 8 days (July 12 to July 20 is 9 days if inclusive? Wait: Wait let me break it down again. From May 12 to June 12: that's one month and zero days? No, actually from May 12 to June 12 is exactly one calendar month, but in terms of actual days between them depends on the number of days in each month. But if we take May has 31 days, so from May 12th to June 12th is (June 12 minus May 12). Let me think: If today is May 1st and tomorrow is June 1st, that's exactly one month. But in terms of days between them exclusive would be 30 or 31? Hmm. This seems confusing again. Maybe better to go step by step: Total number of days from May 12th to July 20th inclusive: First, calculate how many full months are there and then add the remaining days. From May 12 to June 12: that's a month (May), which has 31 days. So if you go from May 12 to June 12, it is exactly one month? Well yes in terms of calendar time, but actual number of days between these two dates depends on the months involved. But since we're starting at day 12th and ending at the same day next month: for example, from May 12 to June 12: that's 31 - 12 = 19 days in May (from May 13th to May 31st) plus the full 12 days of June? No. Wait: Wait if you start on May 12 and go to June 12, how many days is that? If today is May 12, then tomorrow is May 13... until June 12: number of days between them inclusive would be (June 12 - May 12 +1)? Wait no. Actually, the formula for date difference in days when both dates are included is: Days = dayB - dayA + monthOffset But since months have different numbers of days... Alternatively, here's a way: Let me count how many full days there are from May 12 to July 20 inclusive by considering each month. Starting with May: From May 12th (inclusive) to the end of May is May 31st. So that's 31 - 12 + 1 = 20 days (since including both start and end). For example, from day 5 to day 7 inclusive: 7-5+1=3 days. Then June has full month: 30 days. July is only up until July 20th. So that's 20 days if we are considering from the first of July to July 20 inclusive? Wait no, starting from where? Wait after May and June, we go into July. But what date in July do we start counting on? If our initial period is from May 12 (inclusive) up until July 20th (inclusive), then: May: 31-12 +1 = 20 days June: full month 30 days. July: first day to be considered would be July 1st, and we need to count up through July 20. So that's 20 days if inclusive? Wait from July 1 to July 20 is (20 - 1 +1) = 20 days? Yes. So total: 20 + 30 + 20 = 70 days inclusive of both dates. But the original question was "how many days is it between 12/5/2025 and 20/7/2025". So if someone says "between", they might mean exclusive. For example, if you have a period from May 1 to May 3: how many days in between? It's one day (May 2). But inclusive it would be three. So depending on interpretation, but given that the dates are written as dd/mm/yyyy and using "between", I think safest is to calculate exclusive. However, sometimes people consider "between" including both ends when talking about durations. For example, a project starting May 5th and ending July 20th would last for X days inclusive. But since there's no context, perhaps the user wants the total number of calendar days between them excluding neither or excluding one? Alternatively, to avoid ambiguity, I can state both interpretations but given that in most date difference calculations (like in Excel or online calculators), if you take the end date minus start date using DATE functions, it gives the exact count where day differences are exclusive. Wait let me check with a small example. Suppose today is May 5th and tomorrow is May 6th: how many days between them? If I use an online calculator, subtracting 2025-05-05 from 2025-07-20 would give the number of days difference. Let me try with this example: From May 5 to July 20. But without calculating, but let's think: if I do an inclusive count it was 70 days as above (if starting at may12). But for exclusive, subtract two days: so 68? Alternatively, maybe better to calculate via another approach. Let me take the number of months between May and July. From May 12th to July 12th is exactly two calendar months: from May 12th to June 12th (one month) and then to July 12th (another). So that's two months, which would be 31 days for the first part? Wait no: Wait if you take May has 31 days. From May 12th to June 12th is one full month? But in terms of number of days between these dates: from May 12 (inclusive) to June 12 (exclusive), that would be the same as how many days are there between them, which could depend. Alternatively, using a date calculation: Let me consider each step again. Let's think about it like this: Start date is 5/12/2025 (wait no: dd/mm/yyyy so May 12th). End date is July 20th (7/20). So from May 12 to July 20. First, how many days are left in May after the 12th? Since May has 31 days: Number of days remaining: 31 - 12 = 19 days. So if we're counting exclusive of start date and inclusive of end of month (but not sure). Wait this approach is getting tangled. Let me try using another method where I calculate the total number of days from a common reference, say January 1st, to both dates and then subtract them. But without knowing exact day counts for each year... However since we know that in non-leap years: Each month has fixed days: Jan (31), Feb (28), Mar (31), Apr (30), May (31), Jun (30), Jul (31)... etc. So to compute the day of the year for each date, then subtract them. First, let's calculate day of year for 5/12/2025: January has 31 days February: 28 March: 31 April: 30 May: up to May 12th. So total days from January to April inclusive is 31 + 28 + 31 + 30 = let's compute that: January (J): 31 February (F): 28 → Total J/F: 59 March (M): 31 → Total up to March: 59 + 31 = 90 April (A): 30 → total up to April: 90 + 30 = 120. Then May has the 12th day, so add 12 days. So total day of year for May 12 is 120 + 12 = 132nd day in 2025 (since it's not a leap year). Now calculate day of year for July 20. January: 31 February: 28 → up to Feb: 59 March: 31 → total March end is 59 + 31 = 90 April: 30 → 90 + 30 = 120 May: 31 days → 120 + 31 = 151 (end of May) June: 30 days → up to June end is 151 + 30 = 181. July has the 20th day, so total day of year for July 20th is 181 + 20 = 201st day in 2025 (since after January-June it's 181 days, plus 20 from July). Therefore, difference between the two dates' day counts: July 20 is day 201. May 12 is day 132. So difference is 201 - 132 = 69 days. This means that there are 69 days between May 12th and July 20th if we count from the end of one to the start of the other (i.e., exclusive). Wait but what's this exactly? Actually, in terms of day counts: The number of days from January 1st up until a certain date includes that date. So for example, May 12 is on the 132nd day. July 20 is on the 201st. So to find how many days are between them (exclusive), you subtract and get 69 days difference? Wait no: if I want from May 12th to July 20th inclusive, that would be 201 - 132 + 1 = 70 days. Whereas exclusive it's 201 - 132 -1 = 68. Wait but why? Because the number of days between two dates in terms of time elapsed is (end_day_count - start_day_count). If you want to know how many full days pass from May 12th until July 20th, that would be 201 - 132 = 69 days. Wait let me think with a smaller example. Suppose January 1 is day 1 and January 2 is day 2. How many days are between them? If you say from Jan 1 to Jan 2 (exclusive), it's one day: just the period in between, which doesn't exist except for midnight on day 1 to midnight of day 2, but if we're counting calendar days that have passed since start date up until end date. Wait perhaps another approach is needed. If you consider May 12 as day x and July 20 as day y, then the number of full days between them (i.e., how many times a new day has started) would be y - x. So for example: If today is May 12th and tomorrow is May 13th: from the moment you start on May 12 until the end of May 13, that's one full day in between (May 12 to May 13). Wait this seems messy. But using standard date math: If I have two dates, D1 and D2, then the number of days from D1 inclusive up till but not including D2 is calculated as D2 - D1. So if you want total calendar days between them (including both), it's D2 - D1 + 1. So in our case, day counts: D1: May 12 = 132 D2: July 20 = 201 Days inclusive would be 201 - 132 + 1 = 70 days Exclusive (days between them) is D2 - D1 - 1 = 69 - 1? Wait: Wait the formula for exclusive is total_days_between = end_day_count - start_day_count. Because if you have two dates, say Jan 5 and Jan 6. Day count of Jan 5 is 5, day count of Jan 6 is 6. The number of days between them (exclusive) would be zero? No: the period from Jan 5 to Jan 6 exclusive is none, but if you mean the duration in days, it's one full day. Hmm this is confusing again. But according to standard date difference calculation, subtracting two dates gives you the number of days elapsed between them. So for example: If today is May 12 and tomorrow (May 13) is D+1 day: then from May 12 to May 13 inclusive would be one full day? Wait no— if I use a calculator, subtracting two dates where the second date is next day will give you +1. For example: If start_date = "5/12/2025" and end_date = "5/13/2025", then end_date - start_date would be 1 day. This represents how many days have passed between the two dates, which is one day (the time from when you leave May 12 to arrive at May 13). So that's considered as a span of one day. Therefore, in our case, if D1 = May 12 (day count 132), and D2 = July 20th (day count 201), then the difference is 69 days. That would mean from May 12 to July 20 inclusive of both dates? No— that's not, because if you subtract day counts you get elapsed time. Wait let me check with an example again: If I take D1 as Jan 5 (day count 5) and D2 as Jan 6 (day count 6), then difference is 1. Which means it took one full day to go from the start date to the end date, which aligns with elapsed time. Therefore in our case, if May 12th to July 20th gives a difference of 69 days, that would mean there are 69 days between those dates (elapsed), so including both? Wait no— because from D1 up till and including the day before D2 is the number of elapsed days. Wait think about: If I start on May 5th at midnight and end on July 20th at midnight, that would be exactly N days. So how many days are between those dates? In terms of duration, it's (end_day_count - start_day_count) days. So in the example with Jan 5 to Jan 6: difference is one day. Thus, applying this logic: From May 12th to July 20th is 201 - 132 = 69 days. Therefore, there are 69 calendar days between those dates (i.e., the time elapsed from May 5/12 at start to May 7/20). But if someone asks "how many days are in between", they might mean how many full calendar days occur during that period. But depending on interpretation: If you want to count all days starting with May 13th up through July 19th, that would be (69 - 1) = 68 days. But this is only if the question considers between as not including either end date. However in standard calculations, the difference of D2-D1 gives you the elapsed time which includes full days passed. Given all these considerations and since using day count method we get a result of 69 days when subtracting (which would be inclusive or exclusive?), I need to reconcile this with my previous calculation where adding up months gave me 70 days for inclusion. Wait there is an inconsistency here. Earlier, by calculating each month's contribution as: May: from the 12th until end of May: 31 - 12 +1 = 20 June: full 30 days July: up to July 20: 20 days. Total: 70. But according to day count difference, it's 69. There must be a mistake here. Let me check the day of year calculation again. First for May 12th: January (J) has 31 February (F): 28 → cumulative J/F = 59 March: +31 → total up to March is 90 April: +30 → up to April, total is 120. Then adding May's days: since it's the 12th day of May, we add 12. So May 12 = 120 + 12 = 132. That seems right. Now for July 20: January to June cumulative is J (31) + F (28) + M (31) + A (30) + M (31) + J (30). Let's recalculate that step by step: Jan: 31 Feb: +28 → total up Feb = 59 March: +31 → total March end is 59+31=90 April: +30 → April ends at 90+30=120 May: +31 → May ends at 120+31=151 June: +30 → June ends at 151+30=181. Then July's days up to the 20th is adding 20. So day count for July 20 = 181 + 20 = 201. That seems correct. So difference: 201 - 132 = 69. But when I did the manual calculation of months, I got 70 days inclusive (from May 12 to July 20). Where is this discrepancy? Ah! Because in my previous month-by-month breakdown, I was including both dates: May's contribution as from the 12th to end of month (+1), June full month (30 days), and July up to the 20th. Let me recalculate that: From May 12 inclusive to May 31 inclusive: that is indeed 31 - 12 + 1 = 20 days. Then from June 1st through June 30, which is 30 days (since it's the full month). July 1 through July 20th, including both ends? If I do same formula: end day minus start day plus one. But if starting on July 1 and ending on July 20, that would be 20 - 1 +1 = 20 days. So total is 20 (May) +30 (June)+20(July)=70. But the difference in day counts was only 69! This means there's a miscalculation somewhere. Where? Wait if May 12 to July 20 inclusive is 70 days, but according to day of year it should be 201 - 132 +1 = 70 (because the formula for number of days between two dates inclusive is end_day_count - start_day_count +1). Wait yes: if May 12 is on day count 132 and July 20th is on 201, then the total number of days from May 12 to July 20 inclusive is 201 - 132 +1 = 70. So that matches my manual calculation. Therefore earlier when I said day count difference gives me 69, this was only if we are calculating exclusive dates (i.e., end_day_count - start_day_count). But now it's clear: The number of days between May 5/2025 and July 7/2025 inclusive is 70. Excluding both ends: it would be 68 days (since total inclusive is 70, minus two days). But according to the standard date difference calculation where D1 = day count of start, D2 = day count of end: Days between exclusive = D2 - D1 -1 Wait let me think with numbers. If you have May 5th (day 136) and July 7th (assuming some value), but for our example: Suppose two dates are D1=132, D2=201. The number of days between them inclusive is 201 - 132 +1 = 70. Number of days strictly between them (exclusive) would be total_inclusive minus the count for both ends: 70 - 2 = 68. Alternatively, you can calculate it as D2 - D1 -1 = 201-132=69; 69-1=68. Wait no: Actually formula is (D2 - D1) gives the number of days from start to end exclusive one side? No. Let's take smaller example. Take dates: day_count for Jan 5th = 5, and day_count for Jan 7th =7 Inclusive days between them is 3 (Jan 5,6,7). Exclusive would be 1 (just Jan 6). But D2 - D1 gives 7-5=2. So how to get the exclusive? It seems that formula: total_days_between_exclusive = (D2 - D1) - 1 Wait for our small example: (7-5)-1=2-1=1, which is correct. So in general: if you have two dates with day counts D1 and D2 where D2 > D1, the number of days strictly between them (exclusive) is D2 - D1 - 1. Thus for our case: D2 =201 D1=132 Exclusive days between would be 201-132 -1 =68. But if someone asks "how many days are there between..." they might mean inclusive, or exclusive. Since the question didn't specify, but given that in common language it can vary, I need to see what is standard practice in such scenarios. In most cases, when people ask for the number of days between two dates without specifying inclusion/exclusion, they usually want the duration which is D2 - D1 (i.e., exclusive). For example: "how many days are there from Monday to Wednesday" would be 2 days if you're counting Tuesday and Wednesday as part of it? Or 3 including both? But in common usage like event scheduling or travel durations, people usually mean the number of full nights between two dates. So for example, departing on May 12th and arriving July 20th would require accommodation for (July 20 - May 12) days. Which is D2-D1=69 days. But in our calculation earlier with day counts: If you depart on date A (day count X), arrive at date B (day count Y), the number of nights needed is (Y-X). So for example, if I leave home May 5th and return July 7th, how many nights would that be? If it's a stay from morning to morning: one night on each day except last. But this might vary. But given ambiguity in question, but since using the standard date difference which is D2 - D1 =69 days between May 5/2025 and July 7/2025 (assuming correct dates). Wait wait no: our original problem was from may 12 to july 20. According to day count calculation, that's 69 days difference if using D2 - D1. But in my manual step-by-step I had arrived at inclusive of both ends as 70 days, which would be the total duration including both start and end dates. So returning to original question: "how many days is it between 12/5/2025 and 20/7/2025 (dd/mm/yyyy)?" If I follow standard date difference where you subtract D2 - D1, assuming the user wants the elapsed time which would be 69 days. But if they want inclusive counting of dates as individual units, it's 70. To resolve this definitively, perhaps looking at examples: Suppose today is May 5th (day count X) and tomorrow is May 6th (X+1). The number of days between them would be one day. Which matches D2 - D1 = +1 day. So if I say "how many days are there between Friday the 5th and Saturday the 6th", it's one day. Therefore, in that case, answer is 1, which is D2-D1=1. Similarly, for our main problem: May 12 to July 20 is 69 days, so answer is 69. However, my manual count of inclusive gave me 70. Where's the contradiction? Ah! Let me take a smaller example where I can verify both methods. Let's say from May 5 (day 134) to May 7th (day 136). What is the number of days between them? Using D2-D1=136-134=2. So two days, which would be May 6 and May 7? No, because from May 5 to May 7 inclusive is three days: 5th, 6th, 7th. If I use the formula for exclusive it's D2-D1 -1 =2-1=1 day (only May 6). But in standard terms, if someone asks "how many days between Friday and Sunday", they might mean two days: Saturday and Sunday. Or three including both? It depends on context. But according to the date math where difference is calculated as D2 - D1 gives you number of full elapsed periods between dates. So from May 5 (start) to May 7, if you leave at midnight on the 5th and arrive at midnight on the 7th, that would be two days: day one ends at midnight on May 6th, day two ends at midnight on May 7th. Therefore, it's consistent with D2 - D1=2. Thus returning to original problem: If we consider from May 5/12 (day count 132) to July 20 (day count 201), then difference is 69 days, which would be the number of full calendar days elapsed between those dates. But if someone counts each day as a single unit inclusive, it's 70. But since in standard date calculations and common usage, I think 69 days is correct for "between" when referring to duration. However, my manual calculation said that from May 12 to July 20 inclusive was 70 days. Let me check this with an example where dates are known: Take a smaller period: from May 5 (day count X=134) to May 6th (X+1=135). According to day difference calculation, it's D2-D1=1 day. But inclusive counting would be two days (May 5 and May 6). So if someone asks "how many days is it between May 5th and May 6th", depending on context: could mean one or two. But in the context of duration, like how long you're traveling from May 5 to May 6 inclusive would be one night (if departing may 5 afternoon and arriving may 6 morning). But if counting days as units, it's two. Given that ambiguity, but since the user hasn't specified, perhaps safest is to state both results with explanation. However given that they mentioned dd/mm/yyyy format which might hint at a European context where sometimes inclusive counts are used. But in most international standards (like ISO), the duration between dates is calculated as end date minus start date. However, since I have two different calculations: Using day of year: 69 days Manual addition by months: 70 days for inclusion. This discrepancy suggests a miscalculation somewhere. Let me recheck both methods. First the manual method: From May 5 (wait no: from May 12 to July 20). May has 31 days: Days in May after May 12, including May 12: 31 - 12 + 1 = 20 June full month: 30 July up to the 20th: if starting from July 1st to July 20th inclusive is 20 days (since it's day count difference of 20-1+1=20? Wait no, for example from July 1 to July 1: 1 day. From July 1 to July 3: 3 days. So yes if you calculate as end - start + 1, it works. So if starting on July 1st and ending July 20th inclusive is 20 days (since 20-1+1=20). Therefore total of 20 + 30 + 20 =70. But according to day count difference, it's 69. Where is the error? Ah! Wait in my manual calculation, I added May from 5/12 inclusive to end (including May 12), June full month (which includes all days of June) and July up toJuly 20th including that date. But if we calculate day count difference: May 12 is on day 132. July 20 is day 201. The total number of days inclusive between them would be 201 - 132 + 1 =70, which matches the manual calculation. So where did I get the 69 earlier? Because previously I said D2-D1=201-132=69 and thought that was the answer. Ah! Now it's clear: if you calculate inclusive days between them (including both start and end), it is 70, which matches manual count. If you want exclusive, subtract two: 70 -2 =68. But D2-D1 gives 69 which would be one of the following: Inclusive of start but not end: 70-1=69 Or inclusive of end but not start: same. So in standard date calculations, if you do (end_date - start_date) it's equal to number of days from start to before end. So for example, if I have May 5th and May 6th: (end - start) =1 day which is the period between them starting at May 5 up until but not including May 6. Thus in this case, inclusive count would be 2 (both dates), exclusive count 1. But since our manual calculation gave us inclusive of both as 70 days, and D2-D1=69 gives you from start date to before end date. So depending on what the user wants. The original question was "how many days is it between 12/5/2025 and 20/7/2025?" (dd/mm/yyyy). Given that, if we consider that in British English context (since dd/mm), when someone says "between" they might mean inclusive. For example: the number of days from Monday to Wednesday is three (including both ends). However, this varies by region and usage. To resolve once and for all, let's check with an external method or formula. Using a date calculator: Let me try calculating May 12th, 2025 to July 20th, 2025 using online tool logic. Assume we're in non-leap year (which it is). Let's manually add days step by step from May 12. First, how many days left in May after the 12th: 31 - 12 = 19 days remaining, but since including the start date? Wait no: If I want to count from May 5/12 (inclusive) up till and including July 7/20, it's as follows: From May 12 to May 31: that is 31 - 12 + 1 = 20 days. June has 30 days, so adding those: total now 50. July 1 to July 20: 20 days. Total of 70. So this manual calculation gives 70 inclusive. Therefore if the question is asking for how many days are between including both dates, it's 70. If exclusive, 68. But since the user wrote "between", which in common terms might include both dates or not depending on context. However, to align with standard date calculation where subtracting gives you duration (which would be from start until just before end), but also knowing that manual count includes both ends as 70, I need to check for possible errors. Wait if May 12 is the first day and July 20 is the last day, then number of days between them including both is 70. But how does this relate to D2-D1? As established earlier: inclusive_days = (D2 - D1) + 1 So here: inclusive_days = (201-132)+1=69+1=70, which matches manual calculation. Thus the number of days between May 5/12 and July 20 including both dates is 70. If exclusive it's 68. But since the user didn't specify inclusion or exclusion, but given that in many cases when people ask "how many days are there between X and Y", they might mean inclusive of both. For example: if I say how many days from Monday to Wednesday, most would answer three. However, it's also common for some contexts (like calculating time elapsed) to use exclusive counting. Given that ambiguity but having two methods leading to 70 and 69/68 depending on context, and knowing that the manual step-by-step count gives inclusive as 70 days, which matches with day of year calculation when adding +1. But since in standard date difference (like Excel's DATEDIF function), if you calculate end - start it gives number of days between dates excluding one end. However, without more context, and considering the user might expect the inclusive count (since that's what manual counting gave), but also wanting to be precise. To cover all bases, I'll present both possibilities with explanation, then state which is likely expected. But in many online calculators, if you input start date May 5/12 and end date July 7/20, the number of days between them usually refers to inclusive. For example, a calculator at timeanddate.com: let me simulate that mentally (since I can't access it now). If you calculate from May 5th to July 6th, how many days? Let's say May has 31 days, June 30, and up until July 2nd. But in our case: From May 12 to July 20: inclusive is 70. So if the user wants that number, it's 70. Given that when I calculated day count difference (which gives exclusive) as 69, but manual calculation shows inclusive is 70, and since in many contexts between includes both dates, I think safest answer here is 70 days. But to verify once again with a concrete example: let's take two known dates where we can manually compute. Take from May 12th (day count 132) to May 13th (day count 133). What's the number of days between them? Inclusive is 2, exclusive is 1. Using D2-D1 +1 =1+1=2 (correct for inclusive), and D2-D1 =1 (exclusive). If user asks "how many days between May 5/12 and May 5/13", likely answer would be one day or two? Depending on interpretation. But if I use the manual calculation: from May 12 to May 13 inclusive is 2 days, so that's what a person might expect. Hence, in our main question, the answer should be 70 days between (inclusive). Thus final answer is 70 days.