Date Calculator
Add or subtract days, weeks, months, or years from any date to find a future or past date. Results update as you type — nothing is uploaded.
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Your input stays in your browser — nothing is sent anywhere.
How to use the date calculator
Pick a start date (it defaults to today), choose Add or Subtract, then enter how many days, weeks, months, or years to move. The resulting date — with its weekday — appears instantly, along with how many days it is from today. There's no button to press and nothing leaves your device.
Days from today. To answer questions like "what date is 90 days from today?", leave the start date on today, keep Add selected, and tap the 90 days preset. You'll see the exact date and which day of the week it falls on.
Mixing units. You can combine fields — for example add 1 year, 2 months, and 10 days at once. Years and months are applied first, then weeks and days are added on top.
End-of-month handling. When adding months lands on a day that doesn't exist (like January 31 plus one month), the date is clamped to the last day of the target month — February 28, or February 29 in a leap year.
Everything runs in your browser — the dates you enter are never uploaded.
Common questions
How do I find a date 90 days from today? Leave the start date on today, choose Add, and enter 90 in the Days field (or tap the 90 days preset). The resulting date and weekday appear right away.
How do I subtract days from a date? Pick your start date, choose Subtract, and enter how many days, weeks, months, or years to go back. The earlier date appears as you type.
How are months handled at the end of a month? Months and years are added first, with the day clamped to the target month's length. So January 31 plus one month becomes February 28 (or February 29 in a leap year), and any extra days are added after that.
Does it count weekends and holidays? Yes — this calculator counts every calendar day. It does not skip weekends or holidays.
Is anything saved or uploaded? No. The tool is fully client-side — your input never leaves your browser and nothing is stored.