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#!/usr/bin/gawk
# Challenge 100
#
# TASK #1 > Fun Time
# Submitted by: Mohammad S Anwar
# You are given a time (12 hour / 24 hour).
#
# Write a script to convert the given time from 12 hour format to 24 hour format
# and vice versa.
#
# Ideally we expect a one-liner.
#
# Example 1:
# Input: 05:15 pm or 05:15pm
# Output: 17:15
# Example 2:
# Input: 19:15
# Output: 07:15 pm or 07:15pm
function convert_time(text, hour, arr, pm) {
text = tolower(text)
# get hour
match(text, /^([0-9]+)/, arr)
hour = arr[1]
if (text ~ /am|pm/) {
# 12->24
if (text ~ /pm/) {
if (hour < 12) hour += 12;
}
else { /am/
if (hour == 12) hour = 0;
}
gsub(/^[0-9]+/, "", text);
gsub(/ *(am|pm)/, "", text);
printf("%02d", hour); print text;
}
else {
# 24->12
pm = 0;
if (hour == 0) hour = 12;
else if (hour == 12) pm = 1;
else if (hour > 12) { hour -= 12; pm = 1; }
gsub(/^[0-9]+/, "", text);
printf("%02d%s", hour, text);
if (pm)
print "pm";
else
print "am";
}
}
BEGIN {
convert_time(ARGV[1]);
exit 0;
}
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