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Add or Subtract Days

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

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AHow to use

  1. 01 Pick the base date.
  2. 02 Choose add or subtract, then enter the amount and unit.
  3. 03 Read the resulting date and its weekday.

QFAQ

How are months and years handled? ＋

Calendar arithmetic: adding one month to January 31 lands on February 28/29 — results are clamped to the last valid day of the target month.

Does the timezone matter? ＋

No. Input and output are plain calendar dates, so timezones cannot shift the result.

→Related tools

→ Time Interval Calculator Calculate total duration of time intervals. → Workday Calculator Count working days between dates. → Timestamp Converter Convert Unix timestamps to dates and back, in seconds or milliseconds. → Age Calculator Calculate an exact age in years, months and days — plus the next birthday.