How to compare time

Question

How to compare time in Objective C?

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

Answer 1

For checking current time or any time between two times ::

NSCalendar *calendar = [[NSCalendar alloc]
                        initWithCalendarIdentifier:NSGregorianCalendar];
NSCalendarUnit units = NSYearCalendarUnit | NSMonthCalendarUnit | NSDayCalendarUnit | NSHourCalendarUnit | NSMinuteCalendarUnit;
NSDateComponents *components = [calendar components:units fromDate:[NSDate date]];

return [self isDateComponent:components withinStartHour:startH startMin:startM endHour:endH endMin:endM];

---

-(BOOL)isDateComponent:(NSDateComponents*)components withinStartHour:(int)startH startMin:(int)startM endHour:(int)endH endMin:(int)endM
{
    if (endH < startH) {
        return (  [self isDateComponent:components betweenStartHour:startH startmin:startM endHour:23 endMin:59]  ||
                [self isDateComponent:components betweenStartHour:0 startmin:0 endHour:endH endMin:endM]  );
    }
    else {
        return [self isDateComponent:components betweenStartHour:startH startmin:startM endHour:endH endMin:endM];
    }


}



-(BOOL)isDateComponent:(NSDateComponents*)components betweenStartHour:(int)startH startmin:(int)startM endHour:(int)endH endMin:(int)endM
{

    int currentH = components.hour;
    int currentM = components.minute ;

    DDLogVerbose(@"start : %i-%i, end : %i-%i, current:%i-%i",startH,startM,endH,endM,currentH,currentM);
    startM  = startM + startH * 60;
    endM = endM + endH * 60;

    currentM = components.minute + currentH*60;

    if ( startM <= currentM && currentM < endM ) {
        return YES;
    }
    else {
        return NO;
    }


}