ios 如何将当前日期与iphone中的上一个日期进行比较？
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How to compare current date to previous date in iphone?
提问by Honey
I would like to compare the current date with another date, and if that is date is earlier than the current date, then I should stop the next action. How can I do this?
我想将当前日期与另一个日期进行比较，如果该日期早于当前日期，那么我应该停止下一步操作。我怎样才能做到这一点？
I have todays date in yyyy-MM-ddformat. I need to check this condition
我有今天的日期yyyy-MM-dd格式。我需要检查这个条件
if([displaydate text]<currentdate)
{
//stop next action
}
Here if displaydateis less than todays date then it has to enter that condition.
在这里，如果displaydate小于今天的日期，则必须输入该条件。
回答by Nitin Gohel
NSDate *today = [NSDate date]; // it will give you current date
NSDate *newDate = [dateFormatter dateWithString:@"xxxxxx"]; // your date
NSComparisonResult result;
//has three possible values: NSOrderedSame,NSOrderedDescending, NSOrderedAscending
result = [today compare:newDate]; // comparing two dates
if(result==NSOrderedAscending)
NSLog(@"today is less");
else if(result==NSOrderedDescending)
NSLog(@"newDate is less");
else
NSLog(@"Both dates are same");
got your solution from this answer How to compare two dates in Objective-C
从这个答案中得到了你的解决方案How to compare two date in Objective-C
回答by Paresh Navadiya
Alternativeto @NNitin Gohel'sanswer.
替代以@NNitin Gohel's回答。
Compare using NSTimeIntervalie NSDatetimeIntervalSince1970:
比较使用NSTimeIntervalie NSDatetimeIntervalSince1970：
NSTimeInterval *todayTimeInterval = [[NSDate date] timeIntervalSince1970];
NSTimeInterval *previousTimeInterval = [previousdate timeIntervalSince1970];
if(previousTimeInterval < todayTimeInterval)
//prevous date is less than today
else if (previousTimeInterval == todayTimeInterval)
//both date are equal
else
//prevous date is greater than today
回答by Paras Joshi
Some methods of NSDateclass are:
NSDate类的一些方法是：
isEarlierThanDate. // using this method you can find out the date is previous or not..isLaterThanDateminutesAfterDate.minutesBeforeDate. etc..
isEarlierThanDate. // 使用这个方法你可以找出日期是不是以前的..isLaterThanDateminutesAfterDate.minutesBeforeDate. 等等..
also see this link with many methods of NSDate in iPhone SDK..
还可以查看此链接，其中包含 iPhone SDK 中的许多 NSDate 方法。
how-to-real-world-dates-with-the-iphone-sdk
Update
更新
//Current Date
NSDate *date = [NSDate date];
NSDateFormatter *formatter = nil;
formatter=[[NSDateFormatter alloc] init];
[formatter setDateFormat:@"yyyy-MM-dd"];
use this bellow method for convert NSString date to NSDate format just paste this method in your.m file
使用此波纹管方法将 NSString 日期转换为 NSDate 格式只需将此方法粘贴到 your.m 文件中
- (NSDate *)convertStringToDate:(NSString *) date {
NSDateFormatter *formatter = [[[NSDateFormatter alloc] init] autorelease];
NSDate *nowDate = [[[NSDate alloc] init] autorelease];
[formatter setDateFormat:@"yyyy-MM-dd"];
// NSLog(@"date============================>>>>>>>>>>>>>>> : %@", date);
date = [date stringByReplacingOccurrencesOfString:@"+0000" withString:@""];
nowDate = [formatter dateFromString:date];
// NSLog(@"date============================>>>>>>>>>>>>>>> : %@", nowDate);
return nowDate;
}
after that when you want to use it just use like bellow..
之后，当您想使用它时，只需像下面这样使用..
NSDate *tempDate2 = [self convertStringToDate:yourStringDate];
and then try to compare like this..
然后尝试像这样比较..
if (tempDate2 > nowDate)
回答by btype
You can have a closer look at this Tutorial about NSDateFormatterand when you have your NSDate object you can compare it to another NSDate and get an NSTimeInterval which is the difference in seconds.
你可以仔细看看这个关于 NSDateFormatter 的教程，当你有你的 NSDate 对象时，你可以将它与另一个 NSDate 进行比较并获得一个 NSTimeInterval，它是秒的差异。
NSDate *nowDate = [NSDate date];
NSTimeInterval interval = [nowDate timeIntervalSinceDate:pastDate];
