calculators.dev

Date & Time

Count days, project deadlines, and work out durations between dates with transparent, DST-safe math.

Date & TimeLive
Days Between DatesCount the exact number of days between two dates, with an inclusive/exclusive toggle and a weeks-and-days breakdown.
Date & TimeLive
Date Calculator (Add or Subtract Time)Add or subtract years, months, weeks, and days from any date. Handles month-end clamping (Jan 31 + 1 month → Feb 28) and shows the resulting day of the week.
Date & TimeLive
Business Days CalculatorCount the business (working) days between two dates. Inclusive of both endpoints, excluding weekends and observed US federal holidays.
Date & TimeLive
Age CalculatorCalculate exact age in years, months, and days from a birth date as of today or any chosen date. Shows total days, weeks, and months plus a countdown to the next birthday.
Date & TimeLive
Days Until a Date CalculatorCount the days until a future date from today or any starting date. Shows a signed count, so past dates read as 'X days ago' and today reads as 0.
Date & TimeLive
Deadline / Due Date CalculatorFind a due date by adding calendar days or business (working) days to a start date. Business mode skips weekends and observed US federal holidays.