shell function sleep until

sleep_until.sh

#!/bin/bash

current_time=$(date +%s)
target_time=$(date -d "$*" +%s)
seconds=$(( $target_time - $current_time ))
echo "sleeping $seconds (`date -d "$*"`)"
sleep $seconds


# Usage:
#     sleep_until tomorrow 11:50
#     sleep_until 24 hours
#     sleep_until 2015-02-19 11:50
#     sleep_until next day 04:00