Date math is deceptively fiddly — leap years, month lengths and time zones trip everyone up. These tools do it for you: count the days between two dates, add or subtract a span from a date, or convert a Unix timestamp to a readable date and back.

Handy for planning deadlines, calculating ages or durations, and for developers working with epoch timestamps.

Tools in this category#

• Date Difference — Count the days, weeks, months and years between two dates.
• Add to / Subtract from a Date — Add or subtract days, weeks, months or years from a date.
• Unix Timestamp Converter — Convert Unix timestamps to dates and back, in seconds or milliseconds.

Deadlines, durations and timestamps#

How many days until a launch? Use the date difference tool. What's the date 90 days from now? Add to a date. Debugging a log full of epoch seconds? The timestamp converter turns them into human-readable dates instantly.

Tip: the timestamp converter handles both seconds and milliseconds — useful when moving between systems that use different units.