Date & Time Utilities
Accurate chronological and temporal calculators. Calculate calendar and business day differences excluding holidays, convert timestamps across world timezones, and run interval countdown timers.
Available Date & Time Utilities (5)
Date Addition & Subtraction Calculator
Add or subtract exact years, months, weeks, days, hours, and minutes to or from any calendar date with business day calculations.
Week Number Calculator
Look up the ISO 8601 week number, start and end dates, day of year, and remaining weeks for any calendar date.
Leap Year Checker
Check whether any year in history or the future is a leap year with Gregorian leap rules explanation and astronomical context.
Day of the Week Calculator
Find the exact day of the week (Monday through Sunday) for any historical or future calendar date with Conway's Doomsday rule.
Time Duration Adder & Calculator
Add, subtract, and sum multiple time durations (hours, minutes, seconds) for video editing, timesheets, podcasts, and playlists.
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