iphone - iOS相差2倍

Question

这就是这里的情况。我在时代有当前时间。我也有天数。我想找出两者之间的区别，以纪元格式给出一些过去的时间。即

currentEpochTime - (x days) to give some past time in epoch format.

这是我到目前为止得到的 -

+ (double)currTimeInEpoch
{
    NSDate *todayDate = [NSDate date];
    double ti         = [todayDate timeIntervalSince1970]*1000;
    return ti;    
}

+ (NSString *)timeDiff:(double)epoch diff:(double)diffInDays
{
    double past = epoch - (diffInDays * 24 * 60 * 60 * 1000);
    return [[NSNumber numberWithDouble:past] stringValue];
}

我做的对吗？不确定。有没有更简单的方法来做到这一点？

Answer 1

一个人去很危险。拿着这个。

NSDateComponents *dateComponents = [[NSDateComponents alloc] init];
dateComponents.day = -40; // Number of days to subtract
NSDate *newDate = [[NSCalendar autoupdatingCurrentCalendar] dateByAddingComponents:dateComponents toDate:[NSDate date] options:0];
NSTimeInterval newDateInEpochTime = [newDate timeIntervalSince1970] * 1000;