Add or subtract days, weeks, months, years, hours, minutes and seconds from any date. Shows the result in ISO 8601, RFC 2822 and Unix time. All processing runs locally in your browser. Your data is not uploaded to any server.
100% Local Processing
How to Use
Add or subtract any amount of time from a date. Months and years follow the calendar, so adding one month to January 31st lands you on February 28th.
Steps
Set a base date and time.
Enter an amount, pick a unit, and choose add or subtract.
Click Calculate and read the resulting date in several formats.
Units supported
Years and months, applied against the real calendar.
Weeks and days, applied as exact 7-day and 1-day steps.
Hours, minutes and seconds, applied to the time of day.
Any amount, including fractions such as 1.5 days.
Features
Month and year maths handle short months and leap years correctly.
The result is shown as a wall clock, ISO 8601 and Unix seconds.
Direction is a separate control, so negatives are never ambiguous.
All processing runs locally in your browser. Your data is not uploaded to any server.