Add or Subtract Days from a Date

Add or subtract days, weeks, months or years from a date.

What does Date Add and Subtract Calculator do?

Add or subtract any combination of days, weeks, months and years from a date. Month-end rollover is handled the way people expect — 31 January plus one month is the end of February, not 3 March.

How to Use Date Add and Subtract Calculator

1
Pick a starting dateDefaults to today.
2
Choose add or subtractAnd enter the amounts.
3
Read the resultWith the weekday shown.

Key Features

Add or subtract days, weeks, months and years together
Month-end rollover clamped, so 31 January plus a month is 28 or 29 February
Resulting weekday, week number and day of year shown
Option to count only business days
Quick presets: 30, 60, 90 days and 1 year

Frequently Asked Questions

What is 30 days from today?

Enter today’s date, add 30 days, and the result appears with its weekday. Note that "30 days" and "one month" give different answers in most months.

How is adding a month handled?

By keeping the same day number and clamping to the month end when it does not exist. 31 January plus one month is 28 February (or 29 in a leap year), which is how contracts and spreadsheets treat it.

Does adding months then days give the same as days then months?

Not always — date arithmetic is not commutative once clamping is involved. This calculator applies years, then months, then weeks and days, which is the conventional order.