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Date calculator
Time and date
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About this tool
Find the signed number of calendar days between dates, or add and subtract days from a date.
Common uses
- Find the signed number of calendar days between dates, or add and subtract days from a date.
- Choose start and end dates to see end minus start in days.
How to use it
- 1.Choose start and end dates to see end minus start in days.
- 2.For date offsets, choose a base date, Add or Subtract, and a whole number of days.
Limits and notes
- Offsets accept 0–100000 days. Date differences exclude the starting day and do not count business days.
- Dates and results use the proleptic Gregorian calendar, years 0001–9999, independent of the device timezone. An offset outside that year range is invalid.
Frequently asked questions
What does this tool do?
Find the signed number of calendar days between dates, or add and subtract days from a date.
What should I check before using the result?
Offsets accept 0–100000 days. Date differences exclude the starting day and do not count business days. Dates and results use the proleptic Gregorian calendar, years 0001–9999, independent of the device timezone. An offset outside that year range is invalid.