In Afghanistan, the official language is Pashto and Dari, and the calendar is referred to as the Solar Hijri calendar or the Persian calendar. The Solar Hijri calendar is based on the Gregorian calendar, but its new year begins with the spring equinox, which falls around March 21st or 22nd.

In the Solar Hijri calendar, a year consists of 12 months, with each month having either 29 or 30 days. The first month of the year is called Farvardin, and the last month is called Esfand. The calendar has a total of 365 days, with an additional day added to the end of Esfand in leap years.

The time zone in Afghanistan is Afghanistan Time (AFT), which is 4 hours and 30 minutes ahead of Coordinated Universal Time (UTC+4:30). However, Afghanistan does not observe daylight saving time, so the time difference between Afghanistan and other countries may change depending on the time of year.

In Afghanistan, the standard way of expressing time is the 24-hour clock. For example, 1:00 PM is expressed as 13:00. It is important to note that Afghanistan uses the Persian numbering system, which is different from the Western numbering system. In the Persian system, the numbers are written from right to left, and the decimal point is represented by a comma instead of a period.

In summary, Afghanistan follows the Solar Hijri calendar, which is based on the Gregorian calendar but begins with the spring equinox. The time zone in Afghanistan is AFT, which is 4 hours and 30 minutes ahead of UTC+4:30. The standard way of expressing time in Afghanistan is the 24-hour clock, and the Persian numbering system is used.

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