A collection of time conversion methods in ios development

When developing an iOS program, we sometimes need to adjust the time format to the format we want, which we can do with the NSDateFormatter class.
Such as:

// instantiate 1 NSDateFormatter object
NSDateFormatter *dateFormatter = [[NSDateFormatter alloc] init];
// set the time format, here you can set the format you need
[dateFormatter setDateFormat:@"yyyy-MM-dd HH:mm:ss"];
// get the current system time with [NSDate date]
NSString *currentDateStr = [dateFormatter stringFromDate:[NSDate date]];
// the output format is: 2010-10-27 10:22:13
NSLog(@"%@",currentDateStr);
// after alloc don't forget release for objects that are not used
[dateFormatter release];

ios method code that converts a timestamp to a time string class

// will date The timestamp is converted to a time string 

//@paaram   date             Time for conversion 

//@param    formatString     Time format (yyyy-MM-dd HH:mm:ss)

//@return   NSString         Returns a word character such as ( 2012 - 8 - 8 11:11:11 ) 

+ (NSString *)getDateStringWithDate:(NSDate *)date

                         DateFormat:(NSString *)formatString

{

    NSDateFormatter *dateFormat = [[NSDateFormatter alloc] init];

    [dateFormat setDateFormat:formatString];

    NSString *dateString = [dateFormat stringFromDate:date];

    NSLog(@"date: %@", dateString);

    [dateFormat release];

    return dateString;

}

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