NSDate和NSString可可

Question

对于我的iPhone应用程序，我必须将NSDate对象转换为字符串，然后将字符串转换回NSDate对象..有人可以帮助我吗？谢谢！

Answer 1

用于将NSDate转换为NSString

NSDateFormatter *formatter = [[NSDateFormatter alloc] init];
[formatter setDateFormat:@"yyyy-MM-dd hh:mm:ss a"];
NSString *stringFromDate = [formatter stringFromDate:myNSDateInstance];

用于将NSString转换为NSDate。

NSDateFormatter *df = [[NSDateFormatter alloc] init];
[df setDateFormat:@"yyyy-MM-dd hh:mm:ss a"];
NSDate *myDate = [df dateFromString: stringFromDate];

Answer 2

您需要查看NSDateFormatter这两个方向都是如此。

Answer 3

将NSDate转换为NSString

NSDateFormatter *formatter = [[NSDateFormatter alloc] init];
[formatter setDateFormat:@"yyyy"];

//Optionally for time zone converstions

[formatter setTimeZone:[NSTimeZone timeZoneWithName:@"..."]];

NSString *stringFromDate = [formatter stringFromDate:myNSDateInstance];

将NSString转换为NSDate

NSString *dateString = @"01-02-2010";

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

// this is imporant - we set our input date format to match our input string
// if format doesn't match you'll get nil from your string, so be careful

[dateFormatter setDateFormat:@"dd-MM-yyyy"];

NSDate *dateFromString = [[NSDate alloc] init];

// voila!
dateFromString = [dateFormatter dateFromString:dateString];

[dateFormatter release];