0100 hours = 1:00 AM
0100 hours is 1:00 AM in standard 12-hour time. On a 24-hour clock it is 01:00. Spoken military time is “zero one hundred hours”.
How to convert 0100
0100 is a morning time (hour 1 on the 24-hour clock). Drop any leading zero and add AM: 1:00 AM. Hours 0000–1159 are all AM.