sleepuntil is a mix of sleep(1) and at(1). It takes the same format of time as at(1), including "noon" or "teatime". Since it uses the parser from at, you can refer to the at man page for the format.
examples
sleepuntil noon && sendmail something sleepuntil 5:00pm && sudo reboot
download
Latest tarball: sleepuntil-1.0.tar.gz (9K, signature)
GitHub: http://github.com/tamentis/sleepuntil/
install
$ ./configure $ make $ sudo make install