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#!/usr/bin/gawk -f
#===============================================================================
#
# FILE: 10001.awk
#
# USAGE: ./10001.awk < INFILE
#
# DESCRIPTION: Analyses each line of standard input to determine if it is
# 12 or 24 hour clock and converts to the other.
#
# REQUIREMENTS: A gawk-compatible awk
# NOTES: The leading zero pad comes from the spec examples.
# AUTHOR: Pete Houston (pete), cpan@openstrike.co.uk
# ORGANIZATION: Openstrike
# VERSION: 1.0
# CREATED: 19/02/21
#===============================================================================
/[01][0-9]:[0-5][0-9]\s*[ap]m/ {
match ($0, /([01][0-9])(:[0-5][0-9])\s*([ap]m)/, a)
hh = a[1]
if (a[3] == "am") {
if (hh == "12") {
hh = "00"
}
} else if (hh < 12) {
hh += 12
}
print hh a[2]
next
}
/[012][0-9]:[0-5][0-9]/ {
match ($0, /([012][0-9])(:[0-5][0-9])/, a)
hh = a[1]
if (hh > 11) {
post = "pm"
} else {
post = "am"
}
if (hh > 12) {
hh = hh % 12
}
if (hh < 1) {
hh = 12
}
print hh a[2] post
next
}
{ next }
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