The second part of the time to change the second part of the time to 0.

When an alarm is triggered using a local notification, the local notification is accurate to seconds. The second part of the time must be omitted during implementation.

I thought of the following method, and it was quite concise. The promotion can also be used to omit the hour part of the time.

Nsdate * oldtime = [nsdate date];
Nstimeinterval interval = oldtime. timeintervalsince1970;

// Divide interval minus interval by the remainder after 60. Nstimeinterval is actually of the double type, and % can only be used for the int type. Therefore, the fmod function is required.

Nsdate * nosecondtime = [nsdate datewithtimeintervalsince1970: interval-fmod (interval, 60)];

The second part of the time to change the second part of the time to 0.