| Hijri Month | Starts On | Day of Week | Days in Month |
|---|---|---|---|
| Muharram 638 | 22-Jul-1240 | Sunday | 29 days. |
| Safar 638 | 20-Aug-1240 | Monday | 30 days. |
| Rabi al-awwal 638 | 19-Sep-1240 | Wednesday | 29 days. |
| Rabi al-thani 638 | 18-Oct-1240 | Thursday | 30 days. |
| Jumada al-awwal 638 | 17-Nov-1240 | Saturday | 30 days. |
| Jumada al-thani 638 | 17-Dec-1240 | Monday | 29 days. |
| Rajab 638 | 15-Jan-1241 | Tuesday | 30 days. |
| Shaban 638 | 14-Feb-1241 | Thursday | 30 days. |
| Ramadan 638 | 16-Mar-1241 | Saturday | 30 days. |
| Shawwal 638 | 15-Apr-1241 | Monday | 29 days. |
| Dhu al-Qidah 638 | 14-May-1241 | Tuesday | 29 days. |
| Dhu al-Hijjah 638 | 12-Jun-1241 | Wednesday | 30 days. |