| Hijri Month | Starts On | Day of Week | Days in Month |
|---|---|---|---|
| Muharram 637 | 2-August-1239 | Tuesday | 30 days. |
| Safar 637 | 1-September-1239 | Thursday | 29 days. |
| Rabi Al-Awwal 637 | 30-September-1239 | Friday | 30 days. |
| Rabi Al-Thani 637 | 30-October-1239 | Sunday | 30 days. |
| Jumada Al-Awwal 637 | 29-November-1239 | Tuesday | 30 days. |
| Jumada Al-Thani 637 | 29-December-1239 | Thursday | 29 days. |
| Rajab 637 | 27-January-1240 | Friday | 30 days. |
| Shaban 637 | 26-February-1240 | Sunday | 30 days. |
| Ramadan 637 | 27-March-1240 | Tuesday | 29 days. |
| Shawwal 637 | 25-April-1240 | Wednesday | 30 days. |
| Dhu Al-Qidah 637 | 25-May-1240 | Friday | 29 days. |
| Dhu Al-Hijjah 637 | 23-June-1240 | Saturday | 29 days. |