#! /bin/ksh93
#
#	Author: Mike Fleming
#	Written: February 2016
#
#	datetoymdhm day month time/year
#
#	convert day, month, and year/time from ls listing to yyyymmdd hhmm

typeset -A mm		# NB - this needs ksh93 not ksh hence line 1

mm=([Jan]="01"
    [Feb]="02"
    [Mar]="03"
    [Apr]="04"
    [May]="05"
    [Jun]="06"
    [Jul]="07"
    [Aug]="08"
    [Sep]="09"
    [Oct]="10"
    [Nov]="11"
    [Dec]="12")

CURRYR=$(date '+%Y')
CURRMTH=$(date '+%m')

DD=$1
MM=${mm[$2]}

MIN=$(echo $3:|cut -f2 -d:)

if [[ "$MIN" == "" ]]
then
	MIN="00"
	HH="00"
	YYYY=$3
else
	HH=$(echo $3:|cut -f1 -d:)
	if (( CURRMTH < MM ))
	then
		YYYY=$((CURRYR - 1))
	else
		YYYY=$CURRYR
	fi
fi

echo $YYYY$MM$DD $HH$MIN