Islamic Hijri Calendar For 1640 CE
| Western Month | Converts To Hijri Month |
|---|
| January 1640 | Ramadan, 1049 |
| February 1640 | Shawwal, 1049 |
| March 1640 | Dhu Al-Qidah, 1049 |
| April 1640 | Dhu Al-Hijjah, 1049 |
| May 1640 | Muharram, 1050 |
| June 1640 | Safar, 1050 |
| July 1640 | Rabi Al-Awwal, 1050 |
| August 1640 | Rabi Al-Thani, 1050 |
| September 1640 | Jumada Al-Awwal, 1050 |
| October 1640 | Jumada Al-Thani, 1050 |
| November 1640 | Rajab, 1050 |
| December 1640 | Shaban, 1050 |
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