5 November 2013 marks the first day of the month of Muharram (1 Muharram 1435 Hijrah), the first month of the Hijriah calendar. However, the Prophet's Hijrah (move from Makkah to Madinah) did not occur in Muharram. The Hijrah is hooked on to Muharram for reasons. Maal Hijrah marks the new year in the Hijiriah calendar.
When dating events such as date of birth and death in Malay history, it is common to provide both the Gregorian date as well as the Hijiriah date.
The Gregorian calendar system is inexact. Because of its inaccuracy, there is the leap year in the Gregorian calendar system.
The Hijiriah calendar system is exact. There is no leap year in the Hijiriah calendar system. As such dates in the Hijiriah calendar system are accurate compared to Gregorian dates.
There are many interesting events and dates in the Hijiriah calendar system.
The first man, Prophet Adam a.s. was created on Friday and Qiamat will occur on a Friday.
Prophet Noah's ark landed on a Friday.
Prophet Muhammad SAW was born on a Monday and the Quran was first revealed to him on a Monday.
Muslims fast on Mondays and Thursdays.
There are many more interesting happenings in history.