Amazingly, this simple task doesn’t seem to exist already, so…
Your task is to write a program that takes as input a 12 hour time, and converts it into “military time”, or 24-hour time format.
Input will be in the form:
Although slight variations are allowed:
The space separating the am/pm from the rest of the time is optional.
The last part can either be “am”/”pm”, or “a”/”p”.
Any capitalization is fine.
Output will be the inputted time, transformed into 24-hour format. It can be a number, or a string.
For both the input and output:
0s in the first place are optional. 0s in the last 3 places are mandatory.
the delimiter separating hours and minutes can be a “:”, ” ” (a space), or nothing.
Midnight can be expressed either as 0000, or 2400.
Midnight will be considered “am”, while noon will be considered “pm”.
Your program can be a function, or a full program, and should either return the result, or output it to the stdout. Trailing whitespace is ok.
Examples (you aren’t required to support every format):
12:00am -> 0000 1200 pm -> 1200 1234Am -> 00:34 134a -> 134 01:34PM -> 13 34 1234pm -> 1234
This is code golf, so the smallest number of bytes wins. Since this is so trivial to solve using a built-in, it would be nice to see some code that manually solves this (but use of built-ins are fine).
Just to clarify, you aren’t required to support every possible format. Supporting only a single input and a single output format (of your choice) is fine. I would however like to limit the format as outlined above (which is already quite free).