Islamic Hijri Calendar For 1640 CE
| Western Month | Converts To Hijri Month |
|---|
| Jan 1640 | Ramadan, 1049 |
| Feb 1640 | Shawwal, 1049 |
| Mar 1640 | Dhu al-Qidah, 1049 |
| Apr 1640 | Dhu al-Hijjah, 1049 |
| May 1640 | Muharram, 1050 |
| Jun 1640 | Safar, 1050 |
| Jul 1640 | Rabi al-awwal, 1050 |
| Aug 1640 | Rabi al-thani, 1050 |
| Sep 1640 | Jumada al-awwal, 1050 |
| Oct 1640 | Jumada al-thani, 1050 |
| Nov 1640 | Rajab, 1050 |
| Dec 1640 | Shaban, 1050 |