Military time converter

What time is 1900?

1900 is 7:00 PM. The hour is 19, which is past 12, so subtract 12: 19 − 12 = 7, and anything from 1200 up is in the afternoon or evening half of the day. Spoken as nineteen hundred. The same subtraction handles the rest of the evening: 2000 is 8:00 PM, 2100 is 9:00 PM, 2200 is 10:00 PM.

What time is 1800?

1800 is 6:00 PM: 18 − 12 = 6. Spoken as eighteen hundred, and written 18:00 wherever the 24-hour clock is civilian rather than military. It sits with 1700 and 1900 among the most looked-up conversions there are, because the evening is where a 24-hour time stops being guessable from the 12-hour one.

What is 8 PM in military time?

8 PM is 2000. Add 12 to the hour: 8 + 12 = 20, then write it as four digits. Going this direction the only thing to remember is the padding: 8 AM is 0800, not 800, because military time is always four digits.

Is midnight 0000 or 2400?

Both name the same instant, and which you write depends on whether you mean the start or the end of a day. A day begins at 0000 and its last minute is 2359. 2400 appears on timesheets and duty rosters to mean the closing boundary of that day, which is the same moment as 0000 on the next one. This converter normalizes 2400 to 0000, the way most software does.

Noon is the other trap. Noon is 1200, never 0000, and midnight in 12-hour writing is 12:00 AM while noon is 12:00 PM. That pair is exactly the ambiguity the 24-hour clock exists to remove: 0000 and 1200 cannot be confused with each other, and neither needs a suffix to be read correctly.

Why timesheets and invoices use 24-hour time

A 12-hour time is only unambiguous while its AM or PM survives. On a timesheet it often does not: a start typed as 6:30 and read back a week later is a twelve-hour question, and on a billable line a twelve-hour question is an argument with a client. Written 0630 or 1830, there is nothing left to interpret. Sorting improves too: 24-hour times order correctly as plain text, where 9:00 AM and 10:00 AM do not. A shift that crosses midnight still needs its date to subtract correctly, in either system, which is the other half of the same problem.

That is why the free timesheet templates use plain start and end columns, and why every entry BillNotch records carries a real dated start and end timestamp rather than a remembered one. Reconstructing yesterday from memory is where both the AM/PM slips and the missing hours come from; automatic time tracking removes the reconstruction step entirely.

Turning 24-hour times into billable hours

One more conversion sits between a pair of military times and an invoice. 1730 to 1945 is 2 hours 15 minutes, not 215 minutes, and an invoice line wants that as 2.25 hours. That is the base-60 problem the hours to decimal calculator handles. Convert to the 24-hour clock to record a time; convert to decimal hours to bill it.