标签：style blog http io ar os sp for on
//NSDate
//1, 创建NSDate对象
NSDate *nowDate = [NSDate date];
NSLog(@"%@",nowDate);
//2, 创建明天现在的时间
NSDate *tomorrow = [NSDate dateWithTimeIntervalSinceNow:24*3600];
NSLog(@"%@",tomorrow);
//3, 创建昨天现在的时间
NSDate *yesterday = [NSDate dateWithTimeIntervalSinceNow:-24*3600];
NSLog(@"%@",yesterday);
//4, 间隔
NSTimeInterval interval = [tomorrow timeIntervalSinceDate:yesterday];
NSLog(@"间隔%.0f",interval/3600);
//计算当前时间和?一个固定时间的差值,如果差值在60秒内,输出“刚 刚”,如果在60秒外3600秒内,输出“xx分钟前”,如果3600秒外, 3600*24秒内,输出“xx?小时前”。
NSDate *t1 = [NSDate dateWithTimeIntervalSinceNow:10];
//
NSTimeInterval time2 = [t1 timeIntervalSinceNow];
if (time2 <= 60) {
NSLog(@"刚刚");
}else if (time2 <= 3600 && time2 > 60){
NSLog(@"%f",time2/3600);
}else{
NSLog(@"%f",time2);
}
//创建时间格式化类
NSDateFormatter *dateFormatter = [[NSDateFormatter alloc] init];
//设置样式
[dateFormatter setDateFormat:@"yyyy年MM月dd日 hh时mm分ss秒"];
//
NSString *dateString = [dateFormatter stringFromDate:nowDate ];
NSLog(@"%@",dateString);
1 // 当前时间创建NSDate
NSDate *myDate = [NSDate date];
NSLog(@"myDate = %@",myDate);
2 //从现在开始的24小时
NSTimeInterval secondsPerDay = 24*60*60;
NSDate *tomorrow = [NSDate dateWithTimeIntervalSinceNow:secondsPerDay];
NSLog(@"myDate = %@",tomorrow);
3//根据已有日期创建日期
NSTimeInterval secondsPerDay1 = 24*60*60;
NSDate *now = [NSDate date];
NSDate *yesterDay = [now addTimeInterval:-secondsPerDay1];
NSLog(@"yesterDay = %@",yesterDay);
4//比较日期
BOOL sameDate = [now isEqualToDate:yesterDay];
NSLog(@"sameDate = %lu",sameDate);
4.1//获取较早的日期
NSDate *earlierDate = [yesterDay earlierDate:now];
NSLog(@"earlierDate = %@",earlierDate);
4.2//较晚的日期
NSDate *laterDate = [yesterDay laterDate:now];
NSLog(@"laterDate = %@",laterDate);
//两个日期之间相隔多少秒
NSTimeInterval secondsBetweenDates= [yesterDay timeIntervalSinceDate:now];
NSLog(@"secondsBetweenDates= %lf",secondsBetweenDates);
//通过NSCALENDAR类来创建日期
NSDateComponents *comp = [[NSDateComponentsalloc]init];
[comp setMonth:06];
[comp setDay:01];
[comp setYear:2001];
NSCalendar *myCal = [[NSCalendaralloc]initWithCalendarIdentifier:NSGregorianCalendar];
NSDate *myDate1 = [myCal dateFromComponents:comp];
NSLog(@"myDate1 = %@",myDate1);
//从已有日期获取日期
unsigned units = NSMonthCalendarUnit|NSDayCalendarUnit|NSYearCalendarUnit;
NSDateComponents *comp1 = [myCal components:units fromDate:now];
NSInteger month = [comp1 month];
NSInteger year = [comp1 year];
NSInteger day = [comp1 day];
//NSDateFormatter实现日期的输出
NSDateFormatter *formatter = [[NSDateFormatteralloc]init];
[formatter setDateStyle:NSDateFormatterFullStyle];//直接输出的话是机器码
//或者是手动设置样式[formatter setDateFormat:@"yyyy-mm-dd"];
NSString *string = [formatter stringFromDate:now];
NSLog(@"string = %@",string);
NSLog(@"formater = %@",formatter);
//获取日期格式对象
- (NSDateFormatter *)dateFormatter {
if (dateFormatter == nil) {
dateFormatter = [[NSDateFormatter alloc] init];
[dateFormatter setDateStyle:NSDateFormatterMediumStyle];
[dateFormatter setTimeStyle:NSDateFormatterNoStyle];
}
return dateFormatter;
标签：style blog http io ar os sp for on
原文地址：http://www.cnblogs.com/iOS-mt/p/4113688.html
