iphone - NSDateFormatter 提供一天回溯日期

Question

使用 NSDateFormatter 来改变日期的格式，它只是返回前一天给它的日期。这是代码：

NSString *strDate = [self.mArrEventDate objectAtIndex:i];

NSString *str = [[NSString alloc] init];
str = [strDate stringByReplacingOccurrencesOfString:@"/" withString:@"-"];

NSDateFormatter *dateFormatter = [[NSDateFormatter alloc] init];
// ...using a date format corresponding to your date
[dateFormatter setDateFormat:@"dd/MM/yyyy"];

// Parse the string representation of the date
NSDate *date = [dateFormatter dateFromString:strDate];

NSDateFormatter *format1 = [[NSDateFormatter alloc]init];

[format1 setTimeZone:[NSTimeZone timeZoneForSecondsFromGMT:0]];

[format1 setDateFormat:@"yyyy-MM-dd"];

NSString *sDate   = [format1 stringFromDate:date];

Answer 1

设置时区

[format1 setTimeZone:[NSTimeZone systemTimeZone]];

OR

[format1 setTimeZone:[NSTimeZone localTimeZone]];

希望，它会帮助你。

谢谢。