All Tools Verse
The best free online time and date tools convert Unix timestamps, switch between time zones, change 12 and 24 hour formats, and work out durations, all in your browser. All Tools Verse has a large set of free time and date tools that run client-side with no sign-up and nothing uploaded. This guide picks the best free tool for each task, from a Unix timestamp converter to a leap year check or a time zone difference.
In this guide
Best time and date tools at a glance
Pick the task, then open the tool. Each is free and needs no account.
| Task | Best free tool | Good for |
|---|---|---|
| Unix timestamp | Unix to Human Time, Human to Unix Time | Logs and APIs |
| 12 to 24 hour | 12 Hour to 24 Hour, 24 Hour to 12 Hour | Schedules and forms |
| Time zone difference | Convert Between Timezones | Meetings across regions |
| Seconds to time | Seconds to Time, Time to Seconds | Durations and code |
| Leap year | Check Leap Year | Is a year a leap year |
| Day of the week | Day of the Week Finder | What day a date falls on |
| Days between units | Days to Hours | Quick duration math |
Unix time and timestamps
Unix time is the number of seconds since the start of 1970, the format most logs and APIs use. Turn a timestamp into a readable date with Unix Time to Human Time, and go the other way with Human Time to Unix Time. For shorter spans, Seconds Since Midnight counts the day in seconds.
12 hour, 24 hour and military time
To switch clock formats, 12 Hour to 24 Hour and 24 Hour to 12 Hour handle the AM and PM math. For the military style, Regular to Military Time and Military to Regular Time do the same. You can also turn a clock value into a fraction with Time to Decimal, which is handy for timesheets.
Time zones
Coordinating across regions is a common headache. Convert Time Between Timezones moves a time from one zone to another, Convert Time Between Countries does it by country, and Calculate Time Zone Difference shows the gap in hours so you can pick a meeting time everyone can make.
Convert durations
For plain duration math, convert between units with Seconds to Time, Time to Seconds, Days to Hours, Hours to Days, Days to Weeks, Days to Months, and Days to Years. Each gives an exact figure without the off by one errors of doing it in your head.
Date facts and finders
To answer questions about a date, Check Leap Year and Leap Year Finder handle leap years, Day of the Week Finder tells you the weekday, and Day of the Year with Find Date by Day of Year map between the two. For seasons and holidays, Season for a Date, Easter Sunday Finder, Christmas Day, and the Friday the 13th Finder have you covered.
Calendars and Julian dates
For calendar work, Draw Monthly Calendar renders any month and Analyze Calendar Date breaks a date into its parts. Astronomers and historians use Julian dates, so Date to Julian Day and Gregorian to Julian Date convert between systems.
Just for fun
A few tools are pure fun: Zodiac Sign by Date and Chinese Zodiac Sign, the Dog Age to Human Years and Cat Age to Human Years converters, and visual toys like Draw Analog Clock and the Memento Mori Calendar.
How to choose the right tool
Start from what you have. A number from a log is a Unix timestamp, so use the Unix converter. A clock value in the wrong format needs the 12 or 24 hour tool. A time in another country needs the time zone converter. A gap between units is a duration converter, and a question about a specific date is one of the finders. Each is a single focused tool, so the answer is one click away.
Trusted alternatives
For programmers, the date command on Linux and macOS converts timestamps offline, and most languages have a built in date library. EpochConverter is a well known site for Unix time, and a world clock site or your phone clock app handles quick time zone checks. For a single conversion or date question, a focused browser tool is faster.
Popular free tools in this guide
Frequently asked questions
How do I convert a Unix timestamp to a date?
Paste it into Unix Time to Human Time for a readable date, or use Human Time to Unix Time for the reverse. Both run in your browser.
How do I convert 24 hour time to 12 hour?
Use 24 Hour to 12 Hour, which adds the AM or PM, and 12 Hour to 24 Hour for the other direction.
How do I find the time difference between two zones?
Use Convert Time Between Timezones to move a time across zones, or Calculate Time Zone Difference to see the gap in hours before scheduling.
How do I check if a year is a leap year?
Enter the year into Check Leap Year, which applies the leap year rule, and use Leap Year Finder to list leap years in a range.
Are these time and date tools free and private?
Yes. Every tool is free with no account, and the calculation runs on your device, so nothing you enter is uploaded.
How do I find what day of the week a date is?
Use the Day of the Week Finder, enter the date, and it returns the weekday, which is useful for planning and historical dates.
This guide is part of our roundup of the best free online tools.