Calculate date differences, convert timezones, format dates, and work with time utilities.
Date and time operations are notoriously tricky in programming. Timezones, daylight saving, date formatting, and duration calculations are common sources of bugs. This collection provides tools for calculating the difference between two dates, converting between timezones, formatting dates in various standards (ISO 8601, RFC 2822, Unix timestamps), and parsing date strings. Useful for backend developers scheduling tasks across timezones, frontend developers formatting dates for display, and anyone who needs to quickly figure out "how many days between these two dates?" without writing throwaway code.
Popular in Date & Time
Calculate the exact time between two dates
Free online date difference calculator. Find the exact number of days, weeks, months, and years between any two dates instantly.
Add or subtract time from any date
Free online date add/subtract calculator. Add or subtract days, weeks, months, or years from any date to find a future or past date.
Convert time between any timezones
Free online timezone converter. Convert any time between world timezones using the browser Intl API with full daylight saving support.
All Date & Time
Calculate the exact time between two dates
Add or subtract time from any date
Convert time between any timezones
See current time in cities worldwide
Convert between ISO 8601 and readable date formats
Find the ISO week number for any date
Calculate exact age from a birthdate
Count down to any date and time
Simple stopwatch with lap times
Convert between 12-hour and 24-hour time
Calculate working days between two dates
Convert between seconds, minutes, hours, and days
Convert dates between different format strings
Check if any year is a leap year
No browser-only tools in this category.
About Date & Time
Calculate date differences, convert timezones, format dates, and work with time utilities. All tools in this category run entirely in your browser with no server-side processing. Your data stays on your device.
Each tool is designed for speed and simplicity. Paste your input, configure options if needed, and copy the result with one click. No sign-up, no installation, no limitations.