# Get the current time
time=`date +"%Y-%m-%d %H:%M:%S"`
# Get a minute ago
time=`date -d "1 minute ago" +"%Y-%m-%d %H:%M:%S"`
Get one hour before #
time=`date -d "1 hour ago" +"%Y-%m-%d %H:%M:%S"`
# Get the day before the time
time=`date -d "1 day ago" +"%Y-%m-%d %H:%M:%S"`