y2038

Your mission

Return the new timestamp when the clock can still hold it, and a refusal when it cannot.

today's brief

January 19, 2038, at 03:14:07 UTC. A signed 32-bit Unix timestamp runs out of room at that exact second and flips over to December 1901. The date has already bitten early: banks writing 20-year mortgages hit it in 2018, and an AOL server fell over in 2006 while scheduling a job 30 years out. Firmware shipping today will still be running then. Add seconds to a clock with a ceiling.

See it in action

add_seconds(1000, 5)

Expected result

Your checklist

For your own tracking. Tests grade your code.

now is a timestamp and add is a number of seconds to add to it. Both are at least 0.
The clock is a signed 32-bit counter, so the largest value it can hold is 2147483647.
Return the new timestamp when it still fits, and -1 when it does not.

More examples

add_seconds(2147483640, 8)

Expected result

-1

Constraints

Expected files

epoch.c

Allowed functions

None. Write every helper yourself.

Back to compete

Solutions

y2038

Your mission

Return the new timestamp when the clock can still hold it, and a refusal when it cannot.

today's brief

See it in action

add_seconds(1000, 5)

Expected result

Your checklist

For your own tracking. Tests grade your code.

now is a timestamp and add is a number of seconds to add to it. Both are at least 0.
The clock is a signed 32-bit counter, so the largest value it can hold is 2147483647.
Return the new timestamp when it still fits, and -1 when it does not.

More examples

add_seconds(2147483640, 8)

Expected result

-1

Constraints

Expected files

epoch.c

Allowed functions

None. Write every helper yourself.

Back to compete

Solutions