如何比较两个日期? [英] How to compare two date?

问题描述

我有三个日期:(1)上一个日期(2)当前日期(3)下一个日期， 我想检查currentDate是否晚于上一个日期且早于nextDate. 我该怎么办?

I have three dates: (1) previousDate (2) currentDate (3) nextDate, I want to check whether currentDate is later then previous date and earlier than nextDate. How do I do that?

推荐答案

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

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

NSDate *dt1 = [[NSDate alloc] init];

NSDate *dt2 = [[NSDate alloc] init];

dt1=[df dateFromString:@"2011-02-25"];

dt2=[df dateFromString:@"2011-03-25"];

NSComparisonResult result = [dt1 compare:dt2];

switch (result)

{

     case NSOrderedAscending: NSLog(@"%@ is greater than %@", dt2, dt1); break;

     case NSOrderedDescending: NSLog(@"%@ is less %@", dt2, dt1); break;

     case NSOrderedSame: NSLog(@"%@ is equal to %@", dt2, dt1); break;

     default: NSLog(@"erorr dates %@, %@", dt2, dt1); break;
}

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