How to compare time

Question

How to compare time in Objective C?

if (nowTime > 9:00 PM) && (nowTime < 7:00 AM) 
{
  doSomething;
}

Answer 1

If you want to get the current hour and compare it to some times, you're going to have to use NSDate, NSDateComponents, and NSCalendar.

NSDateComponents *components = [[NSCalendar currentCalendar] components:NSHourCalendarUnit | NSMinuteCalendarUnit | NSSecondCalendarUnit fromDate:[NSDate date]];
NSInteger currentHour = [components hour];
NSInteger currentMinute = [components minute];
NSInteger currentSecond = [components second];

if (currentHour < 7 || (currentHour > 21 || currentHour == 21 && (currentMinute > 0 || currentSecond > 0))) {
    // Do Something
}

That will check if the time is between 9:00 PM and 7:00 AM. Of course, if you're going to want different times you'll have to change the code a little.

---

Read about NSDate, NSDateComponents, and NSCalendar to learn more.

Answer 2

Theres a perfect formula for this. Just for future references

Below is the sample code :

NSDateComponents *components = [[NSCalendar currentCalendar] components:NSHourCalendarUnit | NSMinuteCalendarUnit | NSSecondCalendarUnit fromDate:[NSDate date]];
NSInteger currHr = [components hour];
NSInteger currtMin = [components minute];

NSString *startTime = @"21:00";
NSString *endTime = @"07:00";

int stHr = [[[startTime componentsSeparatedByString:@":"] objectAtIndex:0] intValue];
int stMin = [[[startTime componentsSeparatedByString:@":"] objectAtIndex:1] intValue];
int enHr = [[[endTime componentsSeparatedByString:@":"] objectAtIndex:0] intValue];
int enMin = [[[endTime componentsSeparatedByString:@":"] objectAtIndex:1] intValue];

int formStTime = (stHr*60)+stMin;
int formEnTime = (enHr*60)+enMin;

int nowTime = (int)((currHr*60)+currtMin);

if(nowTime >= formStTime && nowTime <= formEnTime) {
    // Do Some Nasty Stuff..
}