Some of the offices of al-Muntada al-Islami are in countries which use the Gregorian calendar. We use the Hijri calendar, but this causes us problems when we deal with government departments which do not use the Hijri calendar, or when drawing up budgets, paying salaries and preparing financial reports for the appropriate departments in those countries.
When they need to write the Gregorian date
Question: 1552
Praise be to Allah, and peace and blessings be upon the Messenger of Allah and his family.
There is nothing wrong with using both dates, so long as the Hijri date is written first, followed by the equivalent Gregorian date. The Hijri date is based on the lunar months, which are clear and can be readily observed by anyone who has eyes to see, but the Gregorian months do not have any clearly visible signs and can only be known through calculations. Hence the Islamic sharee’ah uses the Arabic months for the dates of fasting, Hajj, I’tikaaf and so on. Beginning with the Hijri date is also a manifestation of the symbols and features of Islam among those who do not know them. And Allaah knows best.
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Source:
Al-Lu’lu’ al-Makeen min Fataawaa al-Shaykh Ibn Jibreen, p. 53