#!/bin/bash
#author: Chris Sincock
#This software is provided as-is and is not guaranteed to be free of defects. Use it only at your own risk.

datespec="$1"
nowtimesecs=`date "+%s"`

echo "now="$nowtimesecs
datetimesecs=`date -d "$datespec" "+%s"`
sleepsecs=`echo "$datetimesecs-$nowtimesecs"|bc`

if [ $sleepsecs -lt -600 ] ; then
  datespec="$datespec tomorrow"
  datetimesecs=`date -d "$datespec" "+%s"`
  sleepsecs=`echo "$datetimesecs-$nowtimesecs"|bc`
fi
echo "will sleep til:" `date -d "$datespec"`
echo that is $datetimesecs secs
datetimemins=`(echo scale=1; echo "$sleepsecs" / 60 ) | bc`
echo that is $datetimemins mins
echo sleep $sleepsecs
exec sleep $sleepsecs