ios 将NSDate精确到天 （通用版本）

NSDate *nowDate1 = [NSDatedate];

NSDateFormatter *formatter = [[[NSDateFormatteralloc] init] autorelease];

[formatter setDateFormat:(@"yyyy-MM-dd")];

NSMutableString *dateStr = [NSMutableStringstringWithString: [formatter stringFromDate:nowDate1]];//[NSMutableString stringWithFormat: @"%@ 00:00:00 +0000"];

NSLog(@"%@", dateStr);

nowDate1 = [self NSStringDateToNSDate: dateStr];

NSLog(@"%@",nowDate1);

- (NSDate *)NSStringDateToNSDate:(NSString *)string

{

NSDateFormatter *formatter = [[NSDateFormatteralloc] init];

[formatter setTimeZone:[NSTimeZonetimeZoneWithAbbreviation:@"UTC"]];

#define kDEFAULT_DATE_TIME_FORMAT (@"yyyy-MM-dd")

[formatter setDateFormat:kDEFAULT_DATE_TIME_FORMAT];

NSDate *date = [formatter dateFromString:string];

[formatter release];

return date;

}