Time Calculators
Calculate time differences, work hours, and time durations.
Time Calculator (Add/Subtract Hours & Minutes)
Add or subtract hours and minutes to/from any time of day and get the exact resulting clock time.
Time Duration Calculator
Calculate the duration between two times of day, broken into hours, minutes and seconds.
Hours Between Two Times
Calculate the number of hours between two times of day.
Minutes Between Two Times
Calculate the number of minutes between two times of day.
Seconds Between Two Times
Calculate the number of seconds between two times of day.
Time Difference Calculator
Find the exact time difference between two clock times.
Time Until Calculator
Live countdown showing exactly how much time remains until any time of day.
Time Since Calculator
Find out exactly how much time has elapsed since any time of day.
Sleep Calculator
Find the best wake-up times based on 90-minute sleep cycles if you go to bed at a given time.
Bedtime Calculator
Find the best bedtimes based on 90-minute sleep cycles to wake up refreshed at a given time.
Wake Up Time Calculator
Find the best wake-up times based on 90-minute sleep cycles if you go to bed at a given time.
Nap Calculator
Find the ideal nap length and wake-up time — power nap, full sleep cycle, or recovery nap.
World Clock
See the current local time right now in major cities around the world, updating live.
Time Zone Converter
Convert a time from one city's time zone to another, fully daylight-saving-time aware.
UTC Converter
Convert any city's local time to UTC (Coordinated Universal Time).
GMT Converter
Convert any city's local time to GMT (Greenwich Mean Time).
Meeting Time Planner
Enter a meeting time in your city and instantly see the equivalent local time in every other city on your list.
Flight Duration Calculator
Calculate real flight duration between a departure and arrival time in two different time zones.
Hours to Minutes
Convert hours to minutes instantly with the formula shown.
Hours to Seconds
Convert hours to seconds instantly with the formula shown.
Minutes to Hours
Convert minutes to hours instantly with the formula shown.
Minutes to Seconds
Convert minutes to seconds instantly with the formula shown.
Seconds to Minutes
Convert seconds to minutes instantly with the formula shown.
Seconds to Hours
Convert seconds to hours instantly with the formula shown.
Days to Hours
Convert days to hours instantly with the formula shown.
Weeks to Hours
Convert weeks to hours instantly with the formula shown.
Months to Hours
Convert months to hours instantly using a calendar-average month length.
Years to Hours
Convert years to hours instantly using a calendar-average year length.
Decimal Hours Calculator
Convert HH:MM time to decimal hours (or back again) — handy for payroll and timesheets.
Military Time Converter
Convert any time between 12-hour and 24-hour (military) format.
12-Hour to 24-Hour Converter
Convert any time between 12-hour and 24-hour format.
Unix Timestamp Converter
Convert any Unix timestamp (epoch time) to a human-readable date, or a date back to its timestamp.