Date Calculator

Add or subtract days, weeks, months, or years; find the difference between two dates and the day of week.

Dates

Add / Subtract from a date

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Difference between two dates

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Day of the week

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Frequently Asked Questions

How do I add or subtract time from a date?

Choose a start date, enter an amount, select days/weeks/months/years, then click Add or Subtract.

How is the difference between two dates calculated?

The tool compares the two calendar dates (no time of day) and shows the difference in days and other breakdowns.

Why can “+1 month” give different results?

Months have different lengths. Adding months follows calendar rules, so end-of-month dates can shift to the closest valid date.

Does this use time zones or exact hours?

It’s date-based (not time-based). Using dates only helps keep results consistent across time zones.

How do I find the day of the week for a date?

Use the “Day of the week” section and enter the date to see the weekday.