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Editorial Team
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Asked: 2026-06-17T12:02:18+00:00

Here’s my code: NSDate *currDate = [NSDate date]; NSDateFormatter *dateFormatter = [[NSDateFormatter alloc]init]; [dateFormatter

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Here’s my code:

NSDate *currDate = [NSDate date];
NSDateFormatter *dateFormatter = [[NSDateFormatter alloc]init];
[dateFormatter setDateFormat:@"HH:mm:ss"];
NSString *currentTime = [dateFormatter stringFromDate:currDate];

NSDate *now = [NSDate date];
int interval = 1*60; // one minute (minutes*60)
long int nowSeconds = (long int) [now timeIntervalSince1970];
int secondsLeft = interval - (nowSeconds % interval);

NSDate *nextIntervalDate =  [NSDate dateWithTimeIntervalSince1970:nowSeconds+secondsLeft];

NSString *nextTrigger = [dateFormatter stringFromDate:nextIntervalDate];

timeRemaining.text = [NSString stringWithFormat:@"%02d:%02d", secondsLeft/60, secondsLeft%60];

NSLog([NSString stringWithFormat:@"%@:%@", currentTime, nextTrigger]);

if ([currentTime isEqualToString:nextTrigger]) {

}

Problem is, ‘if ([currentTime isEqualToString:nextTrigger])’ is never equal. Because nextTrigger changes to the next time segment before they’re equal. Here is the NSLog:

2013-01-17 15:54:59.987 app[35987:c07] 15:54:59:15:55:00
2013-01-17 15:54:59.997 app[35987:c07] 15:54:59:15:55:00    
2013-01-17 15:55:00.007 app[35987:c07] 15:55:00:15:56:00   <----RIGHT HERE
2013-01-17 15:55:00.016 app[35987:c07] 15:55:00:15:56:00

My code’s nextTrigger is basically a round up of the current time by the nearest minute. ALSO, this whole code segment is in a repeating NSTimer every .1 seconds.

How can I fix this?

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1 Answer

  1. Editorial Team

    I had a somewhat similar problem. What I did was make a copy and check it by that.(one thing is to have both oldTrigger and newTrigger declared already)Check this code 

    NSDate *currDate = [NSDate date];
NSDateFormatter *dateFormatter = [[NSDateFormatter alloc]init];
[dateFormatter setDateFormat:@"HH:mm:ss"];
NSString *currentTime = [dateFormatter stringFromDate:currDate];

NSDate *now = [NSDate date]; 
int interval = 1*60; // one minute (minutes*60)
long int nowSeconds = (long int) [now timeIntervalSince1970];
int secondsLeft = interval - (nowSeconds % interval);

NSDate *nextIntervalDate =  [NSDate dateWithTimeIntervalSince1970:nowSeconds+secondsLeft];
oldTrigger = nextTrigger;
nextTrigger = [dateFormatter stringFromDate:nextIntervalDate];

timeRemaining.text = [NSString stringWithFormat:@"%02d:%02d", secondsLeft/60, secondsLeft%60];

NSLog([NSString stringWithFormat:@"%@:%@", currentTime, nextTrigger]);

if ([currentTime isEqualToString:oldTrigger]) {

}
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