| Hijri Month | Starts On | Day of Week | Days in Month |
|---|---|---|---|
| Muharram 638 | 22-July-1240 | Sunday | 29 days. |
| Safar 638 | 20-August-1240 | Monday | 30 days. |
| Rabi Al-Awwal 638 | 19-September-1240 | Wednesday | 29 days. |
| Rabi Al-Thani 638 | 18-October-1240 | Thursday | 30 days. |
| Jumada Al-Awwal 638 | 17-November-1240 | Saturday | 30 days. |
| Jumada Al-Thani 638 | 17-December-1240 | Monday | 29 days. |
| Rajab 638 | 15-January-1241 | Tuesday | 30 days. |
| Shaban 638 | 14-February-1241 | Thursday | 30 days. |
| Ramadan 638 | 16-March-1241 | Saturday | 30 days. |
| Shawwal 638 | 15-April-1241 | Monday | 29 days. |
| Dhu Al-Qidah 638 | 14-May-1241 | Tuesday | 29 days. |
| Dhu Al-Hijjah 638 | 12-June-1241 | Wednesday | 30 days. |