Date & Time Tools
Work with dates, times, and timezones with ease. Calculate, convert, and format date & time instantly.
All Date & Time Tools (23)
Explore our collection of free date & time tools
Date Calculator
✦ FeaturedAdd or subtract years/months/weeks/days from any date — leap-year aware, weekday output, instant. 100% client-side.
Calculate DateAge Calculator
Calculate your exact age in years, months, and days from any birth date — plus next birthday countdown.
Calculate My AgeBusiness Days Calculator
Calculate working days between two dates, excluding weekends and holidays.
Calculate Business DaysCountdown Timer
Create a live countdown timer to any future date or event, with a shareable link.
Start CountdownDate Calculator
Add or subtract years/months/weeks/days from any date — leap-year aware, weekday output, instant. 100% client-side.
Calculate DateDate Difference
Find the exact difference between two dates in days, weeks, months, and years.
Find DifferenceEpoch Converter
Paste a Unix timestamp (epoch) and get UTC plus local date — or pick a date and get seconds, milliseconds, microseconds, or nanoseconds back. 10, 13, 16, and 19-digit values are auto-detected.
Convert EpochTime Duration Calculator
Enter a start time and an end time to see elapsed hours, minutes, and seconds — including overnight (11pm to 2am) and stacked timesheet segments.
Calculate DurationTimezone Converter
Convert time between any two timezones worldwide, instantly.
Convert TimezoneWeek Number Finder
Find the ISO week number for any date, and see the full week's date range.
Find Week NumberAdd Days to Date
Add any number of days (or weeks/months/years) to a date. Leap-year aware, weekday output, instant.
Add DaysAge in Days/Hours
See your age expressed in days, hours, minutes, and seconds — plus a calendar breakdown. Updates live every second.
Calculate Age in DaysDate Range Generator
Generate a list of dates between two dates with a custom step and date format — copy as text or export to CSV.
Generate RangeDate to Unix Timestamp
Convert a date-time to a Unix timestamp in seconds (and related formats). Instant, private.
Convert to TimestampDays Between Dates
Count the exact number of days between any two dates, with a weekday, weekend, and business-day breakdown.
Count DaysDays Until Date
Count how many days from today until a target date — weekdays, weekends, and business-day split included.
Count Days UntilNext Birthday Countdown
Count down to your next birthday — see exactly how many days, weeks, and months remain, the age you'll turn, and the weekday it falls on, instantly and in-browser.
Start CountdownOvernight Time Duration
Calculate hours between clock times that cross midnight — night shifts and overnight on-call made easy.
Calculate Overnight HoursStopwatch
Millisecond precision stopwatch with lap splits, fastest/slowest highlighting, and one-click copy of results.
Start StopwatchSubtract Days from Date
Subtract days (or weeks/months/years) from a date. Leap-year aware, weekday output, instant.
Subtract DaysTime Format Converter
Convert 12-hour AM/PM ↔ 24-hour, duration strings ↔ seconds, and HH:MM:SS ↔ seconds — with a full reference chart.
Convert TimeTime Zone Info
Look up any IANA time zone — its current local time, UTC offset, abbreviation, and whether daylight saving time is in effect right now.
Look Up Time ZoneUnix Timestamp to Date
Paste a Unix timestamp (seconds or milliseconds) and get UTC, local, ISO, and relative time.
Convert to DateWorld Clock
See the current time in up to 12 cities side by side on one live board, with UTC offsets, time-zone abbreviations and next-day markers. Free, private, no sign-up.
Check World ClockSuggest a Tool
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