When the Gregorian calendar comes to an end then every person is fully aware of the end of the Christian year. The Muslims also celebrate the new year by going around hooting, lighting fire crackers, etc. We should recognise our new year which is the month of Muharram.
Allah Taála says in the Quraan,
ﺇِﻥَّ ﻋِﺪَّﺓَ ﺍﻟﺸُّﻬُﻮﺭِ ﻋِﻨﺪَ ﺍﻟﻠّﻪِ ﺍﺛْﻨَﺎ ﻋَﺸَﺮَ ﺷَﻬْﺮًﺍ ﻓِﻲ ﻛِﺘَﺎﺏِ ﺍﻟﻠّﻪِ ﻳَﻮْﻡَ
ﺧَﻠَﻖَ ﺍﻟﺴَّﻤَﺎﻭَﺍﺕ ﻭَﺍﻷَﺭْﺽَ ﻣِﻨْﻬَﺎ ﺃَﺭْﺑَﻌَﺔٌ ﺣُﺮُﻡٌ ﺫَﻟِﻚَ ﺍﻟﺪِّﻳﻦُ ﺍﻟْﻘَﻴِّﻢُ
ﻓَﻼَ ﺗَﻈْﻠِﻤُﻮﺍْ ﻓِﻴﻬِﻦَّ ﺃَﻧﻔُﺴَﻜُﻢْ ﻭَﻗَﺎﺗِﻠُﻮﺍْ ﺍﻟْﻤُﺸْﺮِﻛِﻴﻦَ ﻛَﺂﻓَّﺔً ﻛَﻤَﺎ
ﻳُﻘَﺎﺗِﻠُﻮﻧَﻜُﻢْ ﻛَﺂﻓَّﺔً ﻭَﺍﻋْﻠَﻤُﻮﺍْ ﺃَﻥَّ ﺍﻟﻠّﻪَ ﻣَﻊَ ﺍﻟْﻤُﺘَّﻘِﻴﻦَ
Indeed the number of months (in a year) according to Allaah is twelve months (as specified) in the Book of Allaah (the Lowhul Mahfoodh) , (on) the day He created the heavens and the earth. Of these, four are sacred (Dhul Qa’dah, Dhul Hijjah, Muharram and Rajab – sacred because no fighting should take place during these months). This is the straight Deen, so do not oppress
(wrong) yourselves in these months (by committing sins) . Fight all the Mushrikeen (in every country) just as they fight all of you (wherever you may be), and know that indeed Allaah is with those who possess Taqwa (and will assist them against their enemies).
Generally to count in decimals of ten is quite easy for one and all. The Islamic month is either 29 or 30 days for us which is quite easy to calculate. According to the Gregorian calendar, the month of Febrauary is 28 days for three years and on the fourth year it is 29 days. The Gregorian calendar is calculated according to the solar year and the Islamic calendar is calculated according to the lunar year and both are quite in order.
We should make an effort to remember the special events in our lives according to the Islamic dates. Generally if a person is asked the year he had qualified Madrasah, or the year of marriage, etc. he will immediately quote the Christian year and not the Islamic year.