Calculate your exact age in years, months, days, total hours, minutes, and count down to your next birthday.

Calculate elapsed days, weeks, months, years, and business working days between any two dates.

Set precise digital countdown timers and stopwatches with audio chimes and distraction-free fullscreen mode.

Compare times across global timezones and identify overlapping business hours for distributed teams.

Accurate millisecond stopwatch with split lap tracking and lap time analysis.

Calculate exact working business days between two calendar dates excluding weekends and custom holidays.

Calculate precise age in years, months, days, hours, and minutes, plus upcoming birthday countdown and planetary ages.

Convert seamlessly between Unix epoch timestamps (seconds, milliseconds), ISO 8601 UTC strings, and RFC 2822 dates.

Calculate net working business days between two dates excluding weekends and custom non-working days.

Determine whether any Gregorian calendar year is a leap year with astronomical cycle rules.