| Hijri Month | Starts On | Day of Week | Days in Month |
|---|---|---|---|
| Muharram 991 | 25-January-1583 | Tuesday | 30 days. |
| Safar 991 | 24-February-1583 | Thursday | 29 days. |
| Rabi Al-Awwal 991 | 25-March-1583 | Friday | 30 days. |
| Rabi Al-Thani 991 | 24-April-1583 | Sunday | 29 days. |
| Jumada Al-Awwal 991 | 23-May-1583 | Monday | 29 days. |
| Jumada Al-Thani 991 | 21-June-1583 | Tuesday | 30 days. |
| Rajab 991 | 21-July-1583 | Thursday | 29 days. |
| Shaban 991 | 19-August-1583 | Friday | 30 days. |
| Ramadan 991 | 18-September-1583 | Sunday | 30 days. |
| Shawwal 991 | 18-October-1583 | Tuesday | 29 days. |
| Dhu Al-Qidah 991 | 16-November-1583 | Wednesday | 30 days. |
| Dhu Al-Hijjah 991 | 16-December-1583 | Friday | 30 days. |