Date and Time Tools
Date differences, time zones, timers, week numbers and timestamps.
Time Zone Converter
Convert a time between zones, with daylight saving handled for you.Date Difference Calculator
Days between two dates, or a date plus or minus any time.Business Days Calculator
Working days between dates, or a deadline N business days away.Hours Calculator
Hours worked from start and end times, or a whole timesheet.Countdown Timer
Count down to any date, or run a timer with an alarm.Stopwatch
Accurate stopwatch with laps and keyboard shortcuts.Week Number Calculator
ISO and US week numbers, and the dates of any week.Unix Timestamp Converter
Epoch seconds or milliseconds to a date, and back.Day of the Week Calculator
The weekday of any date — past or future.
Date and time tools for planning and scheduling
Working out dates by hand is surprisingly easy to get wrong: months have different lengths, leap years add a day, weekends and holidays move deadlines, and time zones shift with daylight saving. These tools do the counting for you.
- Counting dates: the date difference calculator finds the days, weeks, months and years between two dates or adds time to a date, and the business days calculator counts working days and skips your public holidays.
- Time zones and timestamps: the time zone converter shows the same moment in cities from Los Angeles to Lagos, Nairobi, India and Sydney, and the Unix timestamp converter turns epoch time into dates.
- Calendars: find the day of the week for any date or the ISO week number.
- Timing: a countdown timer with an alarm, an accurate stopwatch with laps, and an hours calculator for shifts and timesheets.
Every tool uses your own device’s clock and time zone, and nothing you enter leaves your browser.