Age Calculator
Find an exact age in years, months and days.
Free calculator
Days Between Dates Calculator
Count signed calendar days between two dates, with an option to include the end date.
How to use this tool
Measure the calendar-day distance from a start date to an end date.
Transparent method
Formula and method
Difference = end date − start date. Inclusive mode adds one day in the direction of the result when the dates differ.
Example
From 1 March to 10 March is 9 elapsed calendar days, or 10 days when the end date is included.
Assumptions and limits
- A negative result means the end date is before the start date.
- The same start and end date returns zero days.
Frequently asked questions
How are calendar dates handled?
CorelyUp uses calendar dates rather than elapsed hours, so daylight-saving time changes do not add or remove a day.
Are leap years included?
Yes. The date engine validates real calendar dates and includes leap days when they fall inside the selected range.
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