Date & Time
Work out ages, date differences, deadlines, business days, week numbers and Unix timestamps across any timezone.
15 tools, all running in your browser.
Fig 1 Two stamps make a duration
Move across to set the clock · Space
Two punched times and the gap between them: 08:57 to 17:32 is 8 h 35 m. The date and time tools count the same way, from your own clock.
Most used
Age Calculator Work out your exact age in years, months and days, plus total weeks, hours and minutes lived, the day you were born and your next birthday. Date Difference Calculator Count days, weeks, months and years between two dates, with or without counting the end date, and switch to business days only in one click. Time Card Calculator Add up a week of clock-in and clock-out times with unpaid breaks, overtime rules and a pay rate, then print or export the card. Unix Timestamp Converter Convert Unix epoch timestamps to human dates and back, with automatic seconds/milliseconds detection, ISO 8601, RFC 2822 and a batch mode.
Everything else
Business Days Calculator Count working days between two dates with a configurable weekend and your own holiday list, saved on this device. Shows the excluded days in full. Countdown Timer Count down to any date and time with a live display, one-click milestone presets, an optional alarm and a shareable link that carries the target. Date Calculator Add or subtract days, weeks, months and years from any date and get the exact result, with an optional business-days-only mode that skips weekends. Days Until Christmas Days until Christmas: a live countdown with days remaining, the weekday the date falls on, and every other major holiday still ahead this year. Decimal Hours Converter Convert hours and minutes to decimal hours and back, with payroll rounding and a whole pasted column converted at once. Hours Calculator Work out the hours between any start and end times, add as many entries as you like, and total them in h:mm and decimal. Military Time Converter Convert 24-hour military time to 12-hour AM/PM and back, with a full clock reference chart and bulk list conversion. Sleep Calculator Find bedtimes and wake-up times aligned to 90-minute sleep cycles, including the time it takes you to fall asleep. Works in both directions. Time Duration Calculator Add or subtract HH:MM:SS durations, total a timesheet of entries into hours and decimal hours, and convert any duration between time units. Time Zone Converter Convert one time across many time zones at once and read a colour-coded hour strip that shows when working hours actually overlap. DST aware. Week Number Calculator Find the ISO 8601 week number for any date, look up the exact date range of a week number, and see the current week with the full year calendar.