#!/bin/sh

# MonthToNumeric.sh
# Mon Jul 28 21:32:25 GMT 2008
# Chieh Cheng
# http://www.CynosureX.com/

# GNU General Public License (GPL) Version 2, June 1991

scriptName=`basename "$0"`

toNumeric ()
{
  m="$1"
  case $m in
    Jan) result="01";;
    Feb) result="02";;
    Mar) result="03";;
    Apr) result="04";;
    May) result="05";;
    Jun) result="06";;
    Jul) result="07";;
    Aug) result="08";;
    Sep) result="09";;
    Oct) result="10";;
    Nov) result="11";;
    Dec) result="12";;
    *) result="99";;
#    *) reportError "Bad month: ${m}!"; result="99";;
  esac

  return "${result}"
}

usage ()
{
  echo "  Usage:   $scriptName [ -p ] \"Month in Three Letters\""
  echo
  echo "             -p    Pad leading zero."
}

padZero=0

if [ $# -eq 2 ]
then
  if [ "$1" = "-p" ]
  then
    padZero=1
    shift
  fi
fi

if [ $# -eq 1 ]
then
  month="$1"
  toNumeric "${month}"
  num=$?

  if [ ${num} -lt 10 -a ${padZero} -eq 1 ]
  then
    echo "0${num}"
  else
    echo ${num}
  fi
else
  usage
fi