This website has a calendar converter.
http://www.afghaneic.org/converter.php
For us there are three main calendars.
The Gregorian: The most common calendar starting from 0 AD (current year 2012)
The Islamic: Used in most Muslim countries starting from 622 AD (current year 1433)
The Jalali: Used in Afghanistan (& Iran) starting from 622 AD (current year 1390)
The reason the Jalali calendar year is different to the Islamic is that it is a Solar calendar and the Islamic one is purely Lunar.
So it's just like the Gregorian calendar except with some variations.
The New Year in Afghanistan starts with Nowroz which is towards the end of March.
The Afghan calendar is based on the zodiac.
Months:

Days:
http://www.afghaneic.org/converter.php
For us there are three main calendars.
The Gregorian: The most common calendar starting from 0 AD (current year 2012)
The Islamic: Used in most Muslim countries starting from 622 AD (current year 1433)
The Jalali: Used in Afghanistan (& Iran) starting from 622 AD (current year 1390)
The reason the Jalali calendar year is different to the Islamic is that it is a Solar calendar and the Islamic one is purely Lunar.
So it's just like the Gregorian calendar except with some variations.
The New Year in Afghanistan starts with Nowroz which is towards the end of March.
The Afghan calendar is based on the zodiac.
Months:

Days:
