| Hijri Month | Starts On | Day of Week | Days in Month |
|---|---|---|---|
| Muharram 991 | 25-Jan-1583 | Tuesday | 30 days. |
| Safar 991 | 24-Feb-1583 | Thursday | 29 days. |
| Rabi al-awwal 991 | 25-Mar-1583 | Friday | 30 days. |
| Rabi al-thani 991 | 24-Apr-1583 | Sunday | 29 days. |
| Jumada al-awwal 991 | 23-May-1583 | Monday | 29 days. |
| Jumada al-thani 991 | 21-Jun-1583 | Tuesday | 30 days. |
| Rajab 991 | 21-Jul-1583 | Thursday | 29 days. |
| Shaban 991 | 19-Aug-1583 | Friday | 30 days. |
| Ramadan 991 | 18-Sep-1583 | Sunday | 30 days. |
| Shawwal 991 | 18-Oct-1583 | Tuesday | 29 days. |
| Dhu al-Qidah 991 | 16-Nov-1583 | Wednesday | 30 days. |
| Dhu al-Hijjah 991 | 16-Dec-1583 | Friday | 30 days. |