export START_H=`date +%H`
export START_M=`date +%m`

CURRENT_H=`date +%H`
CURRENT_M=`date +%M`
TIME=`expr $CURRENT_H - $START_H`

if [ $TIME -gt 0 ] && [ $START_M -lt $CURRENT_M ]; then
    echo "boot time is more than an hour"
fi

export BOOT_TIME=$(date +%s)
current=$(date +%s)
(( current - BOOT_TIME >3600 ))  && echo "More than an hour"

if [ $TIME -gt 0 ] && [ $START_M -lt $CURRENT_M ]; then
    echo "boot time is more than an hour"
fi