Calculate exact ages, date differences, time between events, hours worked between clock-in and clock-out, and optimal sleep cycle bedtimes.
Calculators in this category
- Age Calculator — Calculate exact age between two dates.
- Date Calculator — Add or subtract dates and measure the gap between them.
- Time Calculator — Add, subtract, or convert time values.
- Hours Calculator — Calculate hours worked between start and end times.
- Sleep Calculator — Find bedtime options based on common sleep cycles.
- Countdown Calculator — Get an exact countdown to any future event in days, hours, minutes and seconds plus weekly and monthly view.
- Working Days Calculator — Count exact working days between any two dates excluding weekends and your custom holiday list.
- Day of the Week Calculator — Find the weekday for any date, plus day-of-year, ISO week number, and weeks since the Unix epoch.
- Time Card Calculator — Total daily and weekly hours from clock-in, clock-out, break time, and days worked per week — with optional overtime above 8 hours.
- Time Zone Calculator — Convert a date and time from one IANA time zone to another and see the hour difference between them.
- Military Time Converter — Convert between 12-hour AM/PM clock and 24-hour military time in both directions.
- Sunrise and Sunset Calculator — Estimate sunrise, sunset, and daylight hours for any date using latitude, longitude, and a simplified solar model.