Date & time tools: differences, timestamps, time zones
Calculate the difference between two dates, convert Unix timestamps, find out your age in days, and compare time zones.
Time math is one of the most error-prone parts of everyday work: how many days until a deadline, what 1700000000 means as a date, how many hours between two timestamps that crossed a daylight-saving boundary, and what 9 a.m. London is in New York. This hub collects the date and time tools that come up most often. Every tool runs in your browser - timestamps never go to a server.
Compute differences
Convert formats
Time zones
Free date & time tools: difference calculator, Unix timestamp, time zones
Dates look simple until you have to subtract one from another. Leap years, daylight-saving jumps, timezone offsets and the difference between a date and a moment in time all conspire to make date math harder than it should be. This hub puts the tools on one page: a date-difference calculator, a time-duration tool, an age calculator, a Unix-timestamp converter for developers, and a timezone converter for scheduling across cities.
Every tool is free, no signup, and runs entirely in your browser. The dates you type never leave your device. Calendars follow the Gregorian system, Unix timestamps follow POSIX seconds since 1970-01-01 UTC, and time zones follow the IANA database including the DST transitions that catch a lot of date math by surprise.
If you're doing time math in code, the Unix-timestamp tool is the fastest way to sanity-check that 1700000000 is November 14, 2023 and not some other date you misremembered. If you're scheduling a meeting across continents, the timezone converter shows the UTC offset and the local time side by side so nobody shows up an hour early or a day late.