The Jews used two kinds of calendars:
Civil Calendar - official calendar of
kings, childbirth, and
contracts.
Sacred Calendar - from which festivals were computed.
Hebrew months were alternately 30 and 29 days long. Their year, shorter than ours, had 354 days. Therefore, about every 3 years (7 times in 19 years) an extra 29-day month, Veadar, was added between Adar and Nisan.
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| Names of Months | Corresponds with | No. of Days | Civil Month | Sacred Month |
| Tishri | Sept.-Oct. | 30 | 1 | 7 |
| Heshvan | Oct.-Nov. | 29 or 30 | 2 | 8 |
| Chislev | Nov.-Dec. | 29 or 30 | 3 | 9 |
| Tebeth | Dec.-Jan. | 29 | 4 | 10 |
| Shebat | Jan.-Feb. | 30 | 5 | 11 |
| Adar | Feb.-Mar. | 29 or 30 | 6 | 12 |
| Nisan | Mar.-Apr. | 30 | 7 | 1 |
| Iyar | Apr.-May | 29 | 8 | 2 |
| Sivan | May-June | 30 | 9 | 3 |
| Tammuz | June-July | 29 | 10 | 4 |
| Ab | July-Aug. | 30 | 11 | 5 |
| Elul | Aug.-Sept | 29 | 12 | 6 |
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