Date Calculator

Add or subtract days, weeks, months or years from a date to find deadlines and future dates.

Enter your details and press Calculate to see results.

Example

2026-03-01 + 30 days = 2026-03-31. One month after Jan 31 lands on Feb 28/29.

Adding a month to the 31st of a shorter month clamps to that month's last day — the same convention most legal and billing systems use.

Does this count business days?

No — use the business days calculator if weekends should be excluded.

Exact age in years, months and days from any birth date — plus total days and next birthday countdown.

Count days between two dates, with inclusive totals, weekday counts and weekend counts.

Time between a start and end clock time, with optional break deduction for timesheets.

Count working days between two dates or find the date N business days away, skipping weekends.

ISO-8601 week number for any date, plus that week's Monday-to-Sunday range.

Estimate monthly mortgage payments including principal, interest, taxes and insurance for any home price.