| Hijri Month | Starts On | Day of Week | Days in Month |
|---|---|---|---|
| Muharram 640 | 1-July-1242 | Tuesday | 30 days. |
| Safar 640 | 31-July-1242 | Thursday | 29 days. |
| Rabi Al-Awwal 640 | 29-August-1242 | Friday | 30 days. |
| Rabi Al-Thani 640 | 28-September-1242 | Sunday | 29 days. |
| Jumada Al-Awwal 640 | 27-October-1242 | Monday | 30 days. |
| Jumada Al-Thani 640 | 26-November-1242 | Wednesday | 29 days. |
| Rajab 640 | 25-December-1242 | Thursday | 29 days. |
| Shaban 640 | 23-January-1243 | Friday | 30 days. |
| Ramadan 640 | 22-February-1243 | Sunday | 30 days. |
| Shawwal 640 | 24-March-1243 | Tuesday | 29 days. |
| Dhu Al-Qidah 640 | 22-April-1243 | Wednesday | 30 days. |
| Dhu Al-Hijjah 640 | 22-May-1243 | Friday | 29 days. |