Lunar Calender Duration By Allah [supreme God]

Lunar Calender (in Arabic) Taqweem ul Qamar 

• Word [Taqweem تقویم ]  "means" Calender or calculation of a month.

★ Al-Quran, Surah Tauba (9), Ayat 36–37.

اِنَّ عِدَّةَ الشُّهُوۡرِ عِنۡدَ اللّٰهِ اثۡنَا عَشَرَ شَهۡرًا فِىۡ كِتٰبِ اللّٰهِ يَوۡمَ خَلَقَ السَّمٰوٰتِ وَالۡاَرۡضَ مِنۡهَاۤ اَرۡبَعَةٌ حُرُمٌ​ ؕ ذٰ لِكَ الدِّيۡنُ الۡقَيِّمُ ۙ فَلَا تَظۡلِمُوۡا فِيۡهِنَّ اَنۡفُسَكُمۡ​ ؕ وَقَاتِلُوا الۡمُشۡرِكِيۡنَ كَآفَّةً كَمَا يُقَاتِلُوۡنَكُمۡ كَآفَّةً​  ؕ وَاعۡلَمُوۡۤا اَنَّ اللّٰهَ مَعَ الۡمُتَّقِيۡنَ‏ ﴿9:36﴾ اِنَّمَا النَّسِىۡٓءُ زِيَادَةٌ فِى الۡكُفۡرِ​ يُضَلُّ بِهِ الَّذِيۡنَ كَفَرُوۡا يُحِلُّوۡنَهٗ عَامًا وَّيُحَرِّمُوۡنَهٗ عَامًا لِّيُوَاطِـُٔـوۡا عِدَّةَ مَا حَرَّمَ اللّٰهُ فَيُحِلُّوۡا مَا حَرَّمَ اللّٰهُ​ ؕ زُيِّنَ لَهُمۡ سُوۡۤءُ اَعۡمَالِهِمۡ​ ؕ وَاللّٰهُ لَا يَهۡدِى الۡقَوۡمَ الۡـكٰفِرِيۡنَ ﴿9:37

[9:36] Surely the reckoning of months, in the sight of Allah, is twelve months, laid down in Allah's decree on the day when He created the heavens and the earth; and out of these months four are sacred. That is the true ordainment. Do not, therefore, wrong yourselves, with respect to these months. And fight all together against those who associate others with Allah in His Divinity in the manner that they fight against you all together, and know well that Allah is with the God-fearing. [9:37] The intercalation (of sacred months) is an act of gross infidelity which causes the unbelievers to be led further astray. They declare a month to be lawful in one year and forbidden in another year in order that they may conform to the number of months that Allah has declared as sacred, and at the same time make lawful what Allah has forbidden. Their foul acts seem fair to them. Allah does not direct those who deny the Truth to the Right Way.

★ Questions & Answers.

1. What is the Name using Moon Phases Calendar in Islam?

(Ans) 'Hijri' or HIJRA Calender 'taqweem' using in Islam 'in Latin AH Anno Higaree

Means "The HIJRA of our Lord" 'Aqa'. AH