NSDateFormatter不会在NSDate中转换我的NSString [英] NSDateFormatter doesn't convert my NSString in NSDate
问题描述
我有一个字符串,需要将其转换为日期,但不能正确转换.我不知道为什么...我的代码是:
I have a string and need convert it to a date, but it doesn't convert correctly. I don't know why... my code is:
NSString * fecha = @"2011-12-07 11:11:29.657";
NSDateFormatter *dateFormatter = [[NSDateFormatter alloc] init];
[dateFormatter setDateFormat:@"yyyy-MM-dd HH:mm:ss.ZZZ"];
NSDate *dateFromString = [[NSDate alloc] init];
dateFromString = [dateFormatter dateFromString:fecha];
NSCalendar *calendar = [[NSCalendar alloc] initWithCalendarIdentifier:NSGregorianCalendar];
unsigned units = NSYearCalendarUnit | NSMonthCalendarUnit | NSDayCalendarUnit | NSHourCalendarUnit | NSMinuteCalendarUnit | NSSecondCalendarUnit;
NSDateComponents *components = [calendar components:units
fromDate:dateFromString];
NSInteger* hour = [components hour];
NSInteger* minute = [components minute];
NSInteger* second = [components second];
NSLog(@"Fecha: %@",fecha);
NSLog(@"Format: %@",dateFormatter.dateFormat);
NSLog(@"date: %@",dateFromString);
在我的日志中:
2011-12-07 11:36:11.750 Catalogo-V1[13741:207] Fecha: 2011-12-07 11:11:29.657
2011-12-07 11:36:11.750 Catalogo-V1[13741:207] Format: yyyy-MM-dd HH:mm:ss.ZZZ
2011-12-07 11:36:11.751 Catalogo-V1[13741:207] date: (null)
推荐答案
我认为,您将需要yyyy-MM-dd HH:mm:ss.SSS
而不是格式字符串yyyy-MM-dd HH:mm:ss.ZZZ
.
I think that instead of the format string yyyy-MM-dd HH:mm:ss.ZZZ
, you will want yyyy-MM-dd HH:mm:ss.SSS
.
ZZZ是时区值,而SSS是小数秒.
ZZZ will be a timezone value, whereas SSS is fractional seconds.
另一件事:您不需要行NSDate *dateFromString = [[NSDate alloc] init];
.只需调用NSDate *dateFromString = [dateFormatter dateFromString:fecha];
.日期格式化程序将根据需要分配日期对象.
one other thing: you don't need to have the line NSDate *dateFromString = [[NSDate alloc] init];
. Just call NSDate *dateFromString = [dateFormatter dateFromString:fecha];
. The date formatter will allocate the date object as it needs to.
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