Date calculators
Durations use civil UTC dates (year-month-day) to avoid daylight-saving shifts. A “day” here is a calendar date, not 24 astronomical hours.
Age in years, months and days depends on month lengths. Two tools answer two common questions: a detailed gap, and a plain day count.
Most used
- Age calculatorThe age shown is civil: completed years, then months, then leftover days. It is not the number of days divided by 365.25. An empty “Age on” field means today.
- Date differenceThe main result is a decomposition: 2 years, 5 months, and 10 days, for example. Total days sit beside it. That is not the same need as “how many stay nights.”
- Days between two datesFrom January 1 to January 3, the exclusive gap is 2, the inclusive count is 3. Both are right; they do not answer the same sentence. This tool shows both, without choosing for you.
- Business daysA business day here is Monday through Friday. Saturday is not a business day. Metropolitan France statutory holidays are optional. The interval is inclusive: start and end count. This is not a US federal-holiday calendar.
Subcategories
Gaps and business days
Calendar days, weekends and statutory holidays.
Full list
- Age calculatorThe age shown is civil: completed years, then months, then leftover days. It is not the number of days divided by 365.25. An empty “Age on” field means today.
- Date differenceThe main result is a decomposition: 2 years, 5 months, and 10 days, for example. Total days sit beside it. That is not the same need as “how many stay nights.”
- Days between two datesFrom January 1 to January 3, the exclusive gap is 2, the inclusive count is 3. Both are right; they do not answer the same sentence. This tool shows both, without choosing for you.
- Business daysA business day here is Monday through Friday. Saturday is not a business day. Metropolitan France statutory holidays are optional. The interval is inclusive: start and end count. This is not a US federal-holiday calendar.
- Pregnancy due dateOne date: the first day of the last period. The tool adds 280 days for the due date and 14 days for a model conception.
Questions
Is 29 February handled?
Yes. If the person was born on 29 February and the target year is not a leap year, the next birthday is placed on 28 February.