Time, Date & Timezone Calculators

World clock, time zone converters, business days, duration calculators, and calendar math.

The time and date calculators count days between dates, add or subtract durations, work out business days, convert time zones and do hours-and-minutes arithmetic. Calendar details such as leap years and month lengths are handled for you.

Public holidays vary by country, state and employer, so working-day counts that depend on holidays should be checked against your local calendar. Time zone results follow the standard zone rules, including daylight saving time where it applies.