问题描述

NSTimeInterval时间零点

如何计算NSTimeInterval当日时间的时，分，秒为零点？

我只得到NSTimeInterval ：

NSTimeInterval today = [[NSDate date] timeIntervalSince1970];

如何重置为00:00:00？

解决方案

NSDate *currentDate = [NSDate date];NSDateComponents *currentDateComponents = [calendar components:NSHourCalendarUnit | NSMinuteCalendarUnit | NSSecondCalendarUnit fromDate:currentDate];NSDateComponents *currentDateToMidnight = [[NSDateComponents alloc] init];[currentDateToMidnight setHour:-[currentDateComponents hour]];[currentDateToMidnight setMinute:-[currentDateComponents minute]];[currentDateToMidnight setSecond:-[currentDateComponents second]];NSDate *midnight = [calendar dateByAddingComponents:currentDateToMidnight toDate:currentDate options:0];NSTimeInterval todayTimeInterval = [midnight timeIntervalSince1970];