Date calculator
The date calculator can add or subtract years, months, weeks or days from a date.
Reference date:
Add / Subtract:
Years:
Months:
Weeks:
Days:
Press the "Calculate" button
The concept of dates and calendars is used to measure and track the passage of time. A date is a specific point in time, typically represented by a combination of a day, month, and year. A calendar is a system for organizing and dividing time into units, such as days, weeks, months, and years.
The Gregorian calendar is the most widely used calendar in the world today. It was first introduced by Pope Gregory XIII in 1582, as a reform of the Julian calendar. The Gregorian calendar is a solar calendar, which means that it is based on the Earth's orbit around the Sun. It has 12 months, with a total of 365 or 366 days in a year. The leap year rule, which states that every fourth year is a leap year with an extra day (February 29), is used to ensure that the calendar stays in alignment with the Earth's orbit.
The Gregorian calendar is used by many countries and is the international standard for civil calendars. It is named after Pope Gregory XIII, who introduced the calendar and its reforms.
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