What is 1640 in Military Time?
1640 military time equals
4:40 PM
How to Convert 1640
1640 falls after noon on the 24-hour clock, so the rule is: subtract 12 from the hour and add PM.
16 − 12 = 4 → 4:40 PM (the minutes, 40, stay exactly the same).
Going the other way: 4:40 PM + 12 = 1640. Or skip the math — type 1640 into the military time converter and convert any time instantly on the home page.
Times Around 1640
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 1640
The afternoon. Hospital evening shifts are often posted as 1430–2230 or 1500–2300; 1640 (4:40 PM) shows up on shift boards, after-school activity timetables, and afternoon flight departures.
To say it out loud, read the two pairs: "sixteen forty." In formal military usage you may also hear "sixteen hundred forty hours."
Frequently Asked Questions
Is 1640 AM or PM?
PM. Any military time from 1300 to 2359 is afternoon or evening. 1640 = 4:40 PM.
How do you say 1640 in military time?
"Sixteen forty." Whole hours get the "hundred" treatment (1600 is "sixteen hundred"), but with minutes you read the two pairs.
What is 4:40 PM in military time?
1640. Add 12 to any PM hour: 4 + 12 = 16, so 4:40 PM becomes 1640.
Is 1640 the same as 16:40?
Yes — same time, two writing styles. Schedules in military format drop the colon (1640); European-style 24-hour clocks keep it (16:40). Both mean 4:40 PM.