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

Time Zone Converter Calculate the time difference between places and time zones.

The first version of the modern Solar Hijri calendar, the Jalali calendar, was developed in the 11th century by a group of astronomers including the Persian scientist Omar Khayyam.

Currently, the Julian calendar is 13 days behind the Gregorian calendar. So, to convert from the Julian calendar to the Gregorian calendar, add 13 days; to convert in the opposite direction, …

Find the exact time difference with the Time Zone Converter – Time Difference Calculator which converts the time difference between places and time zones all over the world.

Date: Today Include end date in calculation (1 day is added) Add time fields Add time zone conversion Count only workdays

Calendar for Year 2026 (United States) ... Tools Years with Same Calendar as 2026 Customization Forms Customize this calendar–large – advanced form with more choices …

Week Number Calculator: What Week of the Year Is It? Enter a week number to locate the week on a calendar; or enter any date to see in which week number it falls.

Time Zone Converter Meeting Planner Pick date and locations Find a time Show details Month: Day:

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