convert string into NSDate - iphone

Question

i have a "DateTimeArray" this array contain
DateTimeArray[index 0] = 20.05.2011 12:12:50
DateTimeArray[index 1]= 20.05.2011 12:13:20
DateTimeArray[index 2]= 20.05.2011 12:20:10
all the value are in string,and i want to convert this string into NSDate and only want to access time not date
and then this time values will be stored in array and this newly array will be used for drawing line chart
i hope some one know this issue
thank you very much

Answer 1

Code as follows,
for(int index=0;index<[DateTimeArray count];index++)
{
NSDateFormatter *df = [[NSDateFormatter alloc] init];
[df setDateFormat:#"HH:mm:ss"];
NSString *timeString=[[[DateTimeArray objectAtIndex:index]componentsSeparatedByString:#" "]objectAtIndex:1];
NSDate *time=[df dateFromString:timeString];
[timeArray addObject:time];
[df release];
}

Answer 2

Try this
NSDateFormatter *df = [[NSDateFormatter alloc] init];
[df setDateFormat:#"HH:mm:ss"];
NSDate *formattedDate = [df dateFromString:[DateTimeArray objectAtIndex:requiredIndex]];
[df release];

Answer 3

Best and cleaner approach:
NSDateFormatter *df = [[NSDateFormatter alloc] init];
[df setDateFormat:#"dd.MM.yyyy HH:mm:ss"];
for(int i=0; i < [DateTimeArray count]; ++i)
{
NSString *string = [DateTimeArray objectAtIndex:i];
NSDate *date = [df dateFromString:string];
[timeArray addObject:time];
}
[df release]; // ALWAYS release unused objects
Then to just access hours, and not days, you should select the required components of each NSDate* instance:
// Get the Gregorian calendar
NSCalendar *cal = [[NSCalendar alloc] initWithCalendarIdentifier:NSGregorianCalendar];
// Get the date
NSDate* date = [timeArray objectAtIndex:my_index];
// Get the hours, minutes, seconds
NSDateComponents* hour = [cal components:NSHourCalendarUnit fromDate:date];
NSDateComponents* minute = [cal components:NSMinuteCalendarUnit fromDate:date];
NSDateComponents* second = [cal components:NSSecondCalendarUnit fromDate:date];

Answer 4

NSMutableArray *nsdateArray = [NSMutableArray arrayWithCapacity:[DateTimeArray count]];
NSDateFormatter *dateFormat = [[NSDateFormatter alloc] init];
[dateFormat setDateFormat:#"dd.MM.yyyy HH:mm:ss"];
for(NSString *currentString in DateTimeArray){
NSDate *date = [dateFormat dateFromString:currentString];
[nsdateArray addObject:date];
}
[dateFormat release];
NSLog(#"ArrayWithDate:%#",[nsdateArray description]);

Answer 5

Heres the complete set of code.. Hope it helps..
NSDateFormatter *formatter = [[NSDateFormatter alloc] init];
[formatter setDateFormat:#"HH:mm:ss"];
int i=0;//start for{} loop
NSString *currDate = [formatter dateFromString:[DateTimeArray objectAtIndex:i]];
[formatter release];
Happy iCoding...

Answer 6

NSDateFormatter *timeFormat = [[NSDateFormatter alloc] init];
[timeFormat setDateFormat:#"HH:mm:ss"]
NSString *theTime = [timeFormat dateFromString:date];
or
NSCalendar *calendar = [NSCalendar currentCalendar];
NSDateComponents *components = [calendar components:(kCFCalendarUnitHour | kCFCalendarUnitMinute) fromDate:date];
NSInteger hour = [components hour];
NSInteger minute = [components minute];