bash - Convert seconds to hours, minutes, seconds

Question

How can I convert seconds to hours, minutes and seconds?

show_time() {
  ?????
}

show_time 36 # 00:00:36
show_time 1036 # 00:17:26
show_time 91925 # 25:32:05

Answer 1

Use date, converted to UTC:

$ date -d@36 -u +%H:%M:%S
00:00:36
$ date -d@1036 -u +%H:%M:%S
00:17:16
$ date -d@12345 -u +%H:%M:%S
03:25:45

The limitation is the hours will loop at 23, but that doesn't matter for most use cases where you want a one-liner.

On macOS, run brew install coreutils and replace date with gdate