#!/bin/sh
usage="Usage: utime2ymd <timestamp> [local|gmt]
\n\nConvert 10-digit Unix timestamp to yyyymmdd.hhmmss format
\n use local time zone (default) or UTC/GMT"
[ $1 ] || { echo -e $usage; exit 1 ; }

unixtime=`echo $1|cut -c -10`

if [ $2 ] 
then qual2=`echo $2|awk '{print tolower($1)}'`
    if [ "$qual2" = "gmt" ] 
    then thetime=`perl -e "print scalar(gmtime($unixtime))"`
    fi
else
    qual2="local"
    thetime=`perl -e "print scalar(localtime($unixtime))"`
fi 

YYYYMM=`echo $thetime | awk '{print $5 $2}' \
    | sed 's/Jan/01/;s/Feb/02/;s/Mar/03/;s/Apr/04/;s/May/05/;s/Jun/06/;
           s/Jul/07/;s/Aug/08/;s/Sep/09/;s/Oct/10/;s/Nov/11/;s/Dec/12/'`

DD=`echo $thetime | awk '{printf("%02d",$3)}'`

hhmmss=`echo $thetime | awk '{print $4}' | sed 's/://g'`

echo "$YYYYMM$DD.$hhmmss $qual2"