Obj-C日期-如果更早，明天再做-Obj-CDate-Ifearlier,makeittomorrow

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NSDate has no timezone info. It's just a thin layer over the number of seconds elapsed since its epoch. You can use a calendar and a timezone to turn it into an NSDateComponents, fiddle with the date there, and then format that into a new NSDate.

NSDate没有时区信息。它只是自其纪元以来经过的秒数的薄层。您可以使用日历和时区将其转换为NSDateComponents，在那里摆弄日期，然后将其格式化为新的NSDate。

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NSDate *date = ...;
if ([[NSDate date] timeIntervalSinceDate:date] > 0) {
    date = [date dateByAddingTimeInterval:24*60*60];
}