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How are Days, Weeks, Months and Years Calculated?
Calculation – The main difficulty in calculating a duration between 2 dates is the number of months. Indeed, the course of a month in days is not fixed. It can be 28, 29, 30 or 31 days.
Here are the Calculation Methods:
- Calculation – Calculate the number of months and days between two dates: if the number of days of the start and end dates is identical, all you have to do is calculate the difference in months (the number of days being equal to 0). For example: between March 17, 2022, and July 17, 2022, there are four months and 0 days.
- If there is less than a month between the two dates, the number of months equals 0. It remains to calculate the number of days. For example: between April 7, 2022, and May 6, 2022, there are 0 months and 29 days.
- If there is more than one month among the two dates and the number of the day of the start date is lower than that of the day of the end date (case n°1, see illustration below): we count the months and then add the remaining months’ number of days. For example: between March 10, 2022, and May 15, 2022, there are two months (from March 10 to May 10, 2022) and five days (from May 10 to May 15). If the day number of the start date is greater than that of the end date (case 2, see illustration below):
Calculation – Illustration
- count the number of whole months, then calculate the number of days remaining before the first change of month + the number of days from last month. For example: between January 28, 2022, and April 2, 2022, there are two full months (February and March) and five days (January 29, 30 and 31 + April 1 and 2).
- Analyze the number of years, months and days among two dates: a year corresponds to two dates whose day and month numbers are identical. Example: between June 15, 2022, and June 15, 2023, 1 year ago, August 31, 2022, and August 31, 2024, 2 years ago. Therefore, we count the number of full years; then, we count the number of months and days remaining according to the “calculation of the number of months and days between two dates” above.
- In particular, if the departure date is February 29 (leap year): a full year is counted on February 28 of the following year (not a leap year). If the end year is also a leap year, there are X full years the following February 29. For example, there are four full years between February 29, 2020, and February 29, 2024, and 5 full years between February 29, 2020, and February 28, 2025.
- Calculation – Calculate the number of weeks between two dates: count the number of weeks between the two dates from the first date. Then add the number of remaining days, if any. Please note: here, a week does not necessarily correspond to a week from Monday to Friday. But seven days from the first appointment. For example: from Tuesday, May 10, 2022, to Thursday, May 19, 2022, there is one week and two days.
Calculation – How Many Weeks are there in a Year?
In 2020 Calculation, the calendar year calendar had 53 weeks in total, compared to the usual 52.
2021, there are 52 weeks in the year.
In 2022, there are also 52 weeks in the year.
|Year||Number of weeks||Number of days|
The number of weeks in a year may vary slightly from year to year.
In 2020, the calendar year calendar had 53 weeks in total, compared to the usual 52.
- 2021, there are 52 weeks in the year. In 2022, there are also 52 weeks
Therefore, There will be 250 Days in a year till September 8.
Calculation – How Many Days Until September 8?