Welcome to the world's top site for time, time zones, and astronomy. Organize your life with free online info and tools you can rely on. No sign-up needed.

The Date Calculator adds or subtracts days, weeks, months and years from a given date.

The Duration Calculator calculates the number of days, months and years between two dates.

World time and date for cities in all time zones. International time right now. Takes into account all DST clock changes.

Explore our calculator & converter tools for date, time, astronomy, and more. Calculate years, months, or even seconds, or count the days to your deadline.

Use the World Clock Meeting Planner to find a suitable time to have a telephone conversation, web cast, or meeting with participants in many time zones.

Time Zone Converter – Time Difference Calculator Provides time zone conversions taking into account Daylight Saving Time (DST), local time zone and accepts present, past, or future dates.

Calendar for Year 2025 (United States) ... Tools Years with Same Calendar as 2025 Customization Forms Customize this calendar–large – advanced form with more choices Customize this calendar – …

A guide to all things time zones and Daylight Saving Time on timeanddate.com—including which countries use DST, local time worldwide, a time zone converter, and meeting planner.

The Time Duration Calculator will calculate the time that has elapsed/difference between two dates with time.