leap-second

Your mission

Return whether a wall clock time is valid, including the leap second.

today's brief

June 30, 2012. The world's clocks get an extra second bolted onto the last minute of the day, so UTC reads 23:59:60. Plenty of Linux servers had never been told that a minute can hold 61 seconds, and they hang hard enough that some data centres watched their power draw spike. Qantas went back to checking passengers in by hand. Teach the clock about the second that should not exist.

See it in action

valid_time(12, 30, 45)

Expected result

Your checklist

For your own tracking. Tests grade your code.

hh, mm and ss are non-negative.
A normal time has hh at most 23, mm at most 59 and ss at most 59.
A leap second is written 23:59:60. Second 60 is valid at that minute and nowhere else.
Return 1 for a valid time, 0 otherwise.

More examples

valid_time(23, 59, 60)

Expected result

valid_time(12, 30, 60)

Expected result

Constraints

Expected files

clock.c

Allowed functions

None. Write every helper yourself.

Back to compete

Solutions

leap-second

Your mission

Return whether a wall clock time is valid, including the leap second.

today's brief

See it in action

valid_time(12, 30, 45)

Expected result

Your checklist

For your own tracking. Tests grade your code.

hh, mm and ss are non-negative.
A normal time has hh at most 23, mm at most 59 and ss at most 59.
A leap second is written 23:59:60. Second 60 is valid at that minute and nowhere else.
Return 1 for a valid time, 0 otherwise.

More examples

valid_time(23, 59, 60)

Expected result

valid_time(12, 30, 60)

Expected result

Constraints

Expected files

clock.c

Allowed functions

None. Write every helper yourself.

Back to compete

Solutions