NSDate*date1 = [NSDate date];
NSDate*date2 = [NSDate date];
NSTimeInterval distanceBetweenDates = [date1 timeIntervalSinceDate:date2];
doublesecondsInAnHour = 60;
// 除以3600是把秒化成小时,除以60得到结果为相差的分钟数
NSIntegerhoursBetweenDates = distanceBetweenDates / secondsInAnHour;
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