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| Millennium: | 2nd millennium |
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| Centuries: | 16th century – 17th century – 18th century |
| Decades: | 1600s 1610s 1620s – 1630s – 1640s 1650s 1660s |
| Years: | 1635 1636 1637 – 1638 – 1639 1640 1641 |
1638 (MDCXXXVIII)was a common year starting on Friday of the Gregorian calendar and a common year starting on Monday of the Julian calendar, the 1638th year of the Common Era (CE) and Anno Domini (AD) designations, the 638th year of the 2nd millennium, the 38th year of the 17th century, and the 9th year of the 1630s decade. As of the start of 1638, the Gregorian calendar was 10 days ahead of the Julian calendar, which remained in localized use until 1923.
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