What is 1645 hours in standard time?

4:45 PM

standard (12-hour) time for 1645

1645 hours = 4:45 PM

Key figures

164524-hour time

4:45 PM12-hour time

1,005minutes after midnight

16.75 hhours after midnight

Afternoon/evening (PM)half of the day

435minutes until next midnight

—special time

read as pairsspoken form

The conversion

1645 hours is 4:45 PM. The first two digits are the hour on a 24-hour clock (16) and the last two are the minutes (45). For hours from 13 to 23 you subtract 12, giving 4, and add PM.

How military time works

Military time, more correctly the 24-hour clock, numbers the hours 00 through 23 and writes minutes as two digits, with no colon and no AM or PM. Midnight at the start of a day is 0000 and noon is 1200. The U.S. military, hospitals, aviation, transport and emergency services use it because it removes any doubt between morning and evening times.

Saying it aloud

1645 is read as the hour and then the minutes, for example ‘sixteen forty-five’. Times from 0100 to 0900 begin with ‘zero’, as in ‘zero eight hundred’. The chart above gives the spoken form for every whole hour.

Quick rules

To go from 12-hour to 24-hour time, keep AM hours as they are (except 12 AM, which is 00) and add 12 to PM hours (except 12 PM, which stays 12). To go back, subtract 12 from hours above 12, use AM for hours below 12, and use PM for 12 and above. Use the time-duration calculator when you need the length of the gap between two times.

Today's date at a glance

Today is Thursday, October 1, 2026. That is day 274 of 365 in 2026, in ISO week 40, with 91 days to go before the year ends. The next dates people plan around are Diwali on Saturday, October 10; Columbus Day on Monday, October 12; Halloween on Saturday, October 31. The moon is a Waning Gibbous tonight, with about 75% of its face lit. All of these figures are recalculated when the page loads, so they always describe the day you open it, not the day the page was published.

How the calendar works

The Gregorian calendar has twelve months of 28 to 31 days. A normal year has 365 days and a leap year has 366, with the extra day added to February in every year divisible by four except century years that are not divisible by 400. Because 365 is one more than 52 weeks, most dates move forward one weekday each year and two after a leap day. Weeks are numbered under ISO 8601, which starts weeks on Monday and gives week 1 to the week containing the first Thursday of January.