xcode 我想从字符串转换为日期
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I want convert from string to date
提问by ???
NSDate *LastBuildDate;
NSDate *PubDate;
NSDateFormatter *formatter = [[NSDateFormatter alloc] init];
[formatter setDateFormat:@"yyyyMMddhhmmss"];
LastBuildDate = [formatter dateFromString:buttoninfoamtion.mLastdate];
PubDate=[formatter dateFromString:newsItem.mPubDate];
if([PubDate compare:LastBuildDate])
buttoninfomation.mlastdate and newsItem.mPubDate is string from OpenAPI
buttoninfomation.mlastdate 和 newsItem.mPubDate 是来自 OpenAPI 的字符串
ex)
buttoninfomation.mlastdate: Tue, 18 Oct 2011 15:54:43 +0900
newspub:Tue, 18 Oct 2011 15:58:00 +0900
例如)
buttoninfomation.mlastdate：2011 年 10 月 18 日星期二15:54:43 +0900 新闻发布：2011 年 10 月 18 日星期二 15:58:00 +0900
but
LastBuidDate = (null)
PubDate = (null)
但
LastBuidDate = (null)
PubDate = (null)
I want to compare two factor .
我想比较两个因素。
So date- date or string- string but I think string - string is so complex.
所以日期-日期或字符串-字符串，但我认为字符串-字符串太复杂了。
what wrong up codes?
什么错误的代码？
采纳答案by Jon Skeet
Well the format you've given of "yyyyMMddhhmmss" doesn't match "Tue, 18 Oct 2011 15:54:43 +0900" even slightly.
好吧，您给出的“yyyyMMddhhmmss”格式与“Tue, 18 Oct 2011 15:54:43 +0900”甚至略微不匹配。
Try
尝试
EEE, dd MMM yyyy HH:mm:ss Z
as the format string - see the iOS documentationand the Unix TR#35for more information.
