Splitting time to 10 mins interval in iphone - iphone

Question

i want to split the time in the interval of 30mins, so i can get time like this:
12:00 AM 12:10 AM 12:20 AM .......... till 11:50 PM.
i'm trying something like this :
NSDateFormatter *timeFormat = [[NSDateFormatter alloc] init];
[timeFormat setDateFormat:#"hh:mm a"];
NSDate* fromTime = [timeFormat dateFromString:startTime];
NSDate* toTime = [timeFormat dateFromString:endTime];
NSLog(#"Start time %#",fromTime);
NSLog(#"End time %#",toTime);
NSDate *dateByAddingThirtyMinute;
dateByAddingThirtyMinute = [fromTime dateByAddingTimeInterval:1800];
NSString *formattedDateString;
NSDateFormatter *dateFormatter = [[NSDateFormatter alloc] init];
[dateFormatter setDateFormat:#"hh:mm a"];
formattedDateString = [dateFormatter stringFromDate:dateByAddingThirtyMinute];
NSLog(#"Time after 10 min %#",formattedDateString);
but i am able to print the first ten minute splitting ...
can any one help me how to loop it ...

Answer 1

Both of the other answers are wrong, because they do not account for daylight savings time. To do that, you have to use NSDateComponents and NSCalendar:
NSDate *startDate = ...;
NSDate *endDate = ...;
NSDateComponents *diff = [[NSDateComponents alloc] init];
[diff setMinute:0];
NSCalendar *cal = [NSCalendar currentCalendar];
NSDate *tmp = startDate;
NSMutableArray *dates = [NSMutableArray arrayWithObject:tmp];
while ([tmp laterDate:endDate] == endDate) {
[diff setMinute:[diff minute] + 10];
tmp = [cal dateByAddingComponents:diff toDate:startDate options:0];
[dates addObject:tmp];
}
In this code, I'm not actually running the NSDate objects through the NSDateFormatter, because that should happen at a different level. This code is all about the underlying data (the Model), and NSDateFormatter usually operates at the user-visible level (the View). Plus, it's generally more useful to have the raw data object than the formatted string.

Answer 2

Try with below code
NSString *startTime = #"12:00 AM";
NSString *endTime = #"11:40 AM";
NSDateFormatter *timeFormat = [[[NSDateFormatter alloc] init] autorelease];
[timeFormat setDateFormat:#"hh:mm a"];
NSDate* fromTime = [timeFormat dateFromString:startTime];
NSDate* toTime = [timeFormat dateFromString:endTime];
NSDate *dateByAddingThirtyMinute ;
NSTimeInterval timeinterval = [toTime timeIntervalSinceDate:fromTime];
NSLog(#"time Int %f",timeinterval/3600);
float numberOfIntervals = timeinterval/3600;
NSLog(#"Start time %f",numberOfIntervals);
for(int iCount = 0;iCount<numberOfIntervals*6 ;iCount ++)
{
dateByAddingThirtyMinute = [fromTime dateByAddingTimeInterval:600];
fromTime = dateByAddingThirtyMinute;
NSString *formattedDateString;
NSDateFormatter *dateFormatter = [[[NSDateFormatter alloc] init] autorelease];
[dateFormatter setDateFormat:#"hh:mm a"];
formattedDateString = [dateFormatter stringFromDate:dateByAddingThirtyMinute];
NSLog(#"Time after 10 min %#",formattedDateString);
}

Answer 3

Try this out
int numberOfIntervals = [toDate timeIntervalSinceDate:fromDate]/(10*60);
for (int i = 0; i < numberOfIntervals; i++) {
NSDate *theDate = [date dateByAddingTimeInterval:i * 60 * 10];
NSDateFormatter *dateFormatter = [[NSDateFormatter alloc] init];
[dateFormatter setDateFormat:#"hh:mm a"];
NSString *formattedDateString = [dateFormatter stringFromDate:dateByAddingThirtyMinute];
NSLog(#"Time after 10 min %#",formattedDateString);
[dateFormatter release];
}