Time & Date Tools
Convert timestamps, compare time zones, count working days and track elapsed time. These tools use the browser Intl time zone database, so daylight saving transitions do not silently corrupt the answer.
All Time & Date Tools (27 Available)
Age Calculator
Find your exact age in years, months, days, hours and minutes.
Date Difference Calculator
Days, weeks, months and years between any two dates.
Hours Calculator
Add up worked hours and convert them to decimal for payroll.
Cron Expression Generator
Build a cron schedule visually and get the expression.
Cron Expression Explainer
Paste a cron expression and read what it actually does.
Time Unit Converter
Convert seconds, minutes, hours, days, weeks and years.
Unix Timestamp Converter
Convert Unix timestamps to dates and back, in any unit.
Current Unix Timestamp
The live Unix timestamp right now, in every unit.
Timestamp to Date Converter
Turn a Unix timestamp into a readable date and time.
Date to Timestamp Converter
Turn a calendar date and time into a Unix timestamp.
Time Zone Converter
Compare a time across multiple cities and time zones.
Business Days Calculator
Count working days between dates, excluding weekends and holidays.
Countdown Timer
Count down to a date, or run a timer with an alert.
Online Stopwatch
A precise stopwatch with lap times, right in your browser.
Week Number Calculator
Find the ISO week number for any date, and vice versa.
Leap Year Checker
Check whether any year is a leap year, and see why.
Days in Month Calculator
How many days are in any month of any year.
Date Add and Subtract Calculator
Add or subtract days, weeks, months or years from a date.
Days Calculator
How many days between dates, or since and until a date.
Weeks Calculator
Count weeks between dates, with the leftover days shown.
Months Calculator
Count complete months between two dates.
Years Calculator
Count complete years between two dates.
Age in Days Calculator
Find your exact age in days, hours and minutes.
Age in Months Calculator
Find your exact age in months and remaining days.
Time Difference Calculator
Calculate elapsed time between two clock times.
Pomodoro Timer
Focus in 25-minute sprints with automatic breaks.
Online Alarm Clock
Set an alarm for any time, right in your browser.
About Time & Date Tools
Date arithmetic is deceptively hard. Adding one month to 31 January, counting business days across a daylight saving boundary, or converting a timestamp that was recorded in seconds when your code expects milliseconds are all classic sources of off-by-one bugs. These tools handle each case explicitly and tell you which convention they used.
Time zone conversion uses the IANA time zone database built into your browser, so it accounts for historical and future daylight saving rules rather than a fixed UTC offset.
Timestamp tools accept seconds, milliseconds and microseconds and detect which you pasted from the magnitude, then show the result in UTC, your local zone and ISO 8601 at the same time.
Time & Date Tools FAQs
What is a Unix timestamp?
The number of seconds elapsed since 00:00:00 UTC on 1 January 1970, ignoring leap seconds. It is the standard way computers store an instant in time because it is timezone-independent.
Why does my timestamp show as 1970 or a date thousands of years away?
You have a unit mismatch. A millisecond timestamp read as seconds lands tens of thousands of years in the future; a second timestamp read as milliseconds lands in January 1970. Our converter detects the unit automatically and lets you override it.
Do these tools handle daylight saving time?
Yes. Time zone conversions use the IANA database through the browser Intl API, which includes the full historical record of DST rules for each zone.
Which time zone do results use?
Results are shown in UTC and in your browser local time zone side by side, and the converter lets you pick any IANA zone explicitly so there is never any ambiguity.