NSDate和NSString的转换

用于uidate，picker。。

+(NSDate*) convertDateFromString:(NSString*)uiDate

{

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

[formatter setDateFormat:@"yyyy年MM月dd日"];

NSDate *date=[formatter dateFromString:uiDate];

return date;

}

输入的日期字符串形如：@"1992-05-21 13:08:08"

- (NSDate*)dateFromString:(NSString*)dateString{

NSDateFormatter*dateFormatter = [[NSDateFormatteralloc]init];

[dateFormattersetDateFormat:@"yyyy-MM-dd HH:mm:ss"];

NSDate*destDate= [dateFormatterdateFromString:dateString];

[dateFormatterrelease];

returndestDate;

}

- (NSString*)stringFromDate:(NSDate*)date{

NSDateFormatter*dateFormatter = [[NSDateFormatteralloc]init];

//zzz表示时区，zzz可以删除，这样返回的日期字符将不包含时区信息。

[dateFormattersetDateFormat:@"yyyy-MM-dd HH:mm:ss zzz"];

NSString*destDateString = [dateFormatterstringFromDate:date];

[dateFormatterrelease];

returndestDateString;

}

- (IBAction)handleDidPressBtn1{

NSLog(@"%@/n", [selfdateFromString:@"2011-08-09 12:02:01"]);

NSLog(@"%@/n", [selfstringFromDate:[selfdateFromString:@"2011-08-09 12:02:01"]]);

}

输出结果如下：

2011-08-09 04:02:01 +0000

2011-08-09 12:02:01 GMT+08:00