I need to convert the time from 12-hour time to 24hr time And converts this to 24hr time Input 03:25PM Output 15:25

CodePudding user response：

Using perl:

$ LC_TIME=C perl -MTime::Piece -pe 's/\b\d\d:\d\d[AP]M\b/Time::Piece->strptime($&, q{%I:%M%p})->strftime(q{%H:%M})/eg' <<<"03:25PM and 05:15AM"
15:25 and 05:15

Uses the core Time::Piece module to parse and format input words that match two digits followed by a colon followed by two more digits and either AM or PM.

An alternative is something like

perl -pe 's/\b(\d\d:\d\d)AM\b/$1/g; s/\b(\d\d):(\d\d)PM\b/($1   12) . ":$2"/eg'

where one regular expression matches AM times and removes the AM, and one matches PM times and removes the PM while adding 12 to the hours component.

CodePudding user response：

Using date:

date -d '3:25pm'  '%H:%M'

Output: 15:25

As for finding all occurrences of time in that format:

grep -Ei '[0-9] :[0-9] [ap]m'