创建当前时间
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NSDate *date = [NSDate date];
从现在开始的24小时
NSTimeInterval a_day = 24*60*60;
NSDate *tomorrow = [NSDate dateWithTimeIntervalSinceNow:a_day];
根据已有日期创建日期
-
NSTimeInterval a_day = 24*60*60;
-
NSDate *date = [NSDate date];
-
NSDate *tomorrow = [date addTimeInterval: date];
日期比较
-
BOOL isEqual = [date isEqualToDate:tomorrow];
-
f(isEqual){
-
NSLog(@"equal");
//获取较早的日期
-
NSDate *earlier_date = [tomorrow earlierDate:date];
-
NSLog(@"earlierDate = %@",earlierDate);
//较晚的日期
-
NSDate *laterDate = [tomorrow laterDate:date];
-
NSLog(@"laterDate = %@",laterDate);
//两个日期之间相隔多少秒
-
NSTimeInterval secondsInterval= [date timeIntervalSinceDate:tomorrow];
-
NSLog(@"secondsInterval= %lf",secondsInterval);
//通过NSCalendar类来创建日期
-
NSDateComponents *comps = [[NSDateComponentsalloc]init];
-
[comps setMonth:01];
-
[comps setDay:31];
-
[comps setYear:2013];
-
NSCalendar *calendar = [[NSCalendaralloc]initWithCalendarIdentifier:NSGregorianCalendar];
-
NSDate *date = [calendar dateFromComponents:comps];
//从已有日期获取日期
-
unsigned units = NSMonthCalendarUnit|NSDayCalendarUnit|NSYearCalendarUnit;
-
NSDateComponents *_comps = [calendar components:units fromDate:date];
-
NSInteger month = [_comps month];
-
NSInteger year = [_comps year];
-
NSInteger day = [_comps day];
-
-
NSDateFormatter *formatter = [[NSDateFormatteralloc]init];
-
[formatter setDateStyle:NSDateFormatterFullStyle];
-
-
NSString *dateString = [formatter stringFromDate:date];
-
NSLog(@"dateString = %@",dateString);
-
NSLog(@"formater = %@",formatter);
//获取日期格式对象
-
- (NSDateFormatter *)getDateFormatter {
-
if (dateFormatter == nil) {
-
dateFormatter = [[NSDateFormatter alloc] init];
-
[dateFormatter setDateStyle:NSDateFormatterMediumStyle];
-
[dateFormatter setTimeStyle:NSDateFormatterNoStyle];
-
}
-
return dateFormatter;
-
}
NSDate 的一些操作
原文：http://blog.csdn.net/wenhaiwang/article/details/42292599
