Convert 12 hr time to 24 hr format in Ruby

Question

How do I convert \"11am\" and \"10pm\" into \"11:00\" and \"22:00\"? Is there a simple way using the date and time classes?

Answer 1

I would first parse the string with Time#strptime and then output it with Time#strftime. This ensures a strict check with your original format as well.

require 'time'
Time.strptime("10pm", "%I%P").strftime("%H:%M")
=> "22:00"