Date Calculator

Add/Subtract: Add or subtract time intervals from a base date. Useful for calculating deadlines, expiration dates, or scheduling events.

Duration: Calculate the time difference between two dates. Shows the breakdown in days, hours, minutes, and seconds.

Units: Supports seconds, minutes, hours, days, weeks, months, and years. Month/year calculations account for variable month lengths and leap years.

Timezone: All calculations use your browser's local timezone. Times are displayed in local time but can be viewed in ISO format (UTC).

Negative Duration: If the end date is before the start date, the duration will be negative. The absolute values are still shown for convenience.