NSDateFormatter和yyyy-MM-dd [英] NSDateFormatter and yyyy-MM-dd

问题描述

我尝试以2/22/11格式获取NSString日期，并将其转换为以下格式：2011-02-22

I'm trying to take a NSString date in the format "2/22/11" and convert it to this format: 2011-02-22

是我的代码：

NSDate *dateTemp = [[NSDate alloc] init];
NSDateFormatter *dateFormat = [[NSDateFormatter alloc] init];
[dateFormat setDateFormat:@"yyyy-MM-dd"];
dateTemp = [dateFormat dateFromString:newInvoice.date];
newInvoice.date = [dateFormat stringFromDate:dateTemp];

newInvoice.date 以NSString到2/22/11。 dateTemp 结束NIL。 newInvoice.date 也会结束NIL。

newInvoice.date starts as an NSString equal to "2/22/11". dateTemp ends up NIL. newInvoice.date ends up NIL as well.

我不能为我的生活找出原因。

I can't for the life of me figure out why.

推荐答案

您遇到这个问题，因为您的日期格式化不正确。配置newInvoice.date变量存储11:02:23您的dateFormatter应该是@yy：MM：dd，如果您的newInvoice.date变量store2/22/11then your dateFormatter should be @MM / dd / yy

You are facing this problem because your date formatter is not correct.Suppose your newInvoice.date variable store "11:02:23" the your dateFormatter should be @"yy:MM:dd" and if your newInvoice.date variable store"2/22/11" then your dateFormatter should be @"MM/dd/yy"

NSDate *dateTemp = [[NSDate alloc] init];
NSDateFormatter *dateFormat1 = [[NSDateFormatter alloc] init];
NSDateFormatter *dateFormat2 = [[NSDateFormatter alloc] init];

[dateFormat1 setDateFormat:@"MM/dd/yy"];
[dateFormat2 setDateFormat:@"yyyy-MM-dd"];

dateTemp = [dateFormat1 dateFromString:newInvoice.date];
newInvoice.date = [dateFormat2 stringFromDate:dateTemp];

这两种格式都应根据您的要求得到正确的结果

both format should be according to your requirement to get the correct result

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