What is 1621 in Military Time?
1621 military time equals
4:21 PM
How to Convert 1621
1621 falls after noon on the 24-hour clock, so the rule is: subtract 12 from the hour and add PM.
16 − 12 = 4 → 4:21 PM (the minutes, 21, stay exactly the same).
Going the other way: 4:21 PM + 12 = 1621. Or skip the math — type 1621 into the military time converter and convert any time instantly on the home page.
Times Around 1621
See the whole day on one page: Military Time Chart or view the full 24-hour chart.
All Times From 1600 to 1659
Every minute of this hour has its own quick answer page:
- 1600 4:00 PM
- 1601 4:01 PM
- 1602 4:02 PM
- 1603 4:03 PM
- 1604 4:04 PM
- 1605 4:05 PM
- 1606 4:06 PM
- 1607 4:07 PM
- 1608 4:08 PM
- 1609 4:09 PM
- 1610 4:10 PM
- 1611 4:11 PM
- 1612 4:12 PM
- 1613 4:13 PM
- 1614 4:14 PM
- 1615 4:15 PM
- 1616 4:16 PM
- 1617 4:17 PM
- 1618 4:18 PM
- 1619 4:19 PM
- 1620 4:20 PM
- 1621 4:21 PM
- 1622 4:22 PM
- 1623 4:23 PM
- 1624 4:24 PM
- 1625 4:25 PM
- 1626 4:26 PM
- 1627 4:27 PM
- 1628 4:28 PM
- 1629 4:29 PM
- 1630 4:30 PM
- 1631 4:31 PM
- 1632 4:32 PM
- 1633 4:33 PM
- 1634 4:34 PM
- 1635 4:35 PM
- 1636 4:36 PM
- 1637 4:37 PM
- 1638 4:38 PM
- 1639 4:39 PM
- 1640 4:40 PM
- 1641 4:41 PM
- 1642 4:42 PM
- 1643 4:43 PM
- 1644 4:44 PM
- 1645 4:45 PM
- 1646 4:46 PM
- 1647 4:47 PM
- 1648 4:48 PM
- 1649 4:49 PM
- 1650 4:50 PM
- 1651 4:51 PM
- 1652 4:52 PM
- 1653 4:53 PM
- 1654 4:54 PM
- 1655 4:55 PM
- 1656 4:56 PM
- 1657 4:57 PM
- 1658 4:58 PM
- 1659 4:59 PM
When You'll See 1621
The afternoon. Hospital evening shifts are often posted as 1430–2230 or 1500–2300; 1621 (4:21 PM) shows up on shift boards, after-school activity timetables, and afternoon flight departures.
To say it out loud, read the two pairs: "sixteen twenty-one." In formal military usage you may also hear "sixteen hundred twenty-one hours."
Frequently Asked Questions
Is 1621 AM or PM?
PM. Any military time from 1300 to 2359 is afternoon or evening. 1621 = 4:21 PM.
How do you say 1621 in military time?
"Sixteen twenty-one." Whole hours get the "hundred" treatment (1600 is "sixteen hundred"), but with minutes you read the two pairs.
What is 4:21 PM in military time?
1621. Add 12 to any PM hour: 4 + 12 = 16, so 4:21 PM becomes 1621.
Is 1621 the same as 16:21?
Yes — same time, two writing styles. Schedules in military format drop the colon (1621); European-style 24-hour clocks keep it (16:21). Both mean 4:21 PM.