NAME
	sleep-until – sleep until a specified time

SYNOPSIS
	sleep-until [CLOCKNAME | TIMEPOINT] ...

DESCRIPTION
	Pause until TIMEPOINT. TIMEPOINT is the number of seconds
	since Epoch, in UTC but not accounting for leap seconds,
	by default. If CLOCKNAME is specified, TIMEPOINT is the
	number of seconds since the zerotime of that clock.
	TIMEPOINT may be an arbitrary floating point number.
	Pause is continued when interrupted.

	On Linux 4.2.2 the clocks that can be used are:
	* CLOCK_REALTIME
	* CLOCK_MONOTONIC
	* CLOCK_BOOTTIME
	* CLOCK_REALTIME_ALARM
	* CLOCK_BOOTTIME_ALARM
	Note that the neither the coarse clocks, CLOCK_MONOTONIC_RAW
	(the proper implementation of a monotonic clock), nor
	CLOCK_TAI work.

RATIONALE
	Previously, the best way to sleep until a specific time
	was to use date, sleep, and arithmetics in Bash. This is
	very inconvenient, and only allows sleep on a monotonic
	clock.

	This program was written so that the author could combine
	it with mplayer to construct a custom alarm clock.

SEE ALSO
	sleep(1), date(1)