Converting a string to an NSDate - objective-c

Question

How is it possible to convert a string to an NSDate on iOS?

Answer 1

NSString *dateStr = #"20100223";
// Convert string to date object
NSDateFormatter *dateFormat = [[NSDateFormatter alloc] init];
[dateFormat setDateFormat:#"yyyyMMdd"];
NSDate *date = [dateFormat dateFromString:dateStr];
// Convert date object to desired output format
[dateFormat setDateFormat:#"EEEE MMMM d, YYYY"];
dateStr = [dateFormat stringFromDate:date];
[dateFormat release];
Hope this will help you.

Answer 2

You'll want to take a look at NSDateFormatter. Determine the format of the date string and then use dateFromString: to convert the string to an NSDate object.

Answer 3

NSDateFormatter *dateFormat = [[NSDateFormatter alloc] init];
[dateFormat setDateFormat:#"dd/MM/YYYY"];
NSDate *date = [dateFormat dateFromString:dateStr];
list = [self getYear:date];
- (NSMutableArray *)getYear:(NSDate*)date
{
NSDateComponents *components = [[NSCalendar currentCalendar] components:NSCalendarUnitDay | NSCalendarUnitMonth | NSCalendarUnitYear fromDate:date];
int year = [components year];
int month = [components month];
int day = [components day];
NSLog(#"%d",year);
NSMutableDictionary *dateDict = [[NSMutableDictionary alloc] initWithObjectsAndKeys:[NSString stringWithFormat:#"%d", day], #"day", [NSString stringWithFormat:#"%d", month], #"month", [NSString stringWithFormat:#"%d", year], #"year", nil];
return dateDict;
}

Answer 4

My working version in Swift
func dateFor(timeStamp: String) -> NSDate
{
let formater = NSDateFormatter()
formater.dateFormat = "HH:mm:ss:SSS - MMM dd, yyyy"
return formater.dateFromString(timeStamp)!
}
func timeStampFor(date: NSDate) -> String
{
let dateFormatter = NSDateFormatter()
dateFormatter.dateFormat = "HH:mm:ss:SSS - MMM dd, yyyy"
return dateFormatter.stringFromDate(date)
}

Answer 5

A simple approach even if you have sqlite DB:
// NSTimeInterval is basically typedef of double so you can receive it as double also.
NSTimeInterval *current = [[NSDate date] timeIntervalSince1970];
[DB addToDB:current];
//retrieve the date from DB
NSDate *retrievedDateItem = [[NSDate alloc] initWithTimeIntervalSince1970:[getDBValueAsDouble]]; //convert it from double (NSTimeInterval) to NSDate
// Set the style
[dateFormatter setDateStyle:NSDateFormatterMediumStyle];
[dateFormatter setTimeStyle:NSDateFormatterMediumStyle];
// Converted to string
NSString *convertedDate = [dateFormatter stringFromDate:retrievedDateItem];
The output for this example:
Aug 3, 2015, 12:27:50 PM

Answer 6

+(NSDate*)str2date:(NSString*)dateStr{
if ([dateStr isKindOfClass:[NSDate class]]) {
return (NSDate*)dateStr;
}
NSDateFormatter *dateFormat = [[NSDateFormatter alloc] init];
[dateFormat setDateFormat:#"yyyy-MM-dd"];
NSDate *date = [dateFormat dateFromString:dateStr];
return date;
}