Objective c 计算两个日期之间的白天和夜间时间
我试图以秒为单位计算两个日期之间的白天和夜间时间,因为“夜间时间”定义为晚上8:00到早上7:59,“白天时间”定义为早上8:00到晚上7:59。我将要与当前时间戳进行比较的过去日期总是比现在的时间短24小时 我该怎么做?白天时间=(#从今天到最后一天的天数)*12)+(今天白天时间的天数)+(最后一天白天时间的天数) 夜间时间=((从今天到最后一天的天数)*12)+(今天的夜间时间)+(最后一天的夜间时间) 编辑Objective c 计算两个日期之间的白天和夜间时间,objective-c,cocoa,date,time,nsdate,Objective C,Cocoa,Date,Time,Nsdate,我试图以秒为单位计算两个日期之间的白天和夜间时间,因为“夜间时间”定义为晚上8:00到早上7:59,“白天时间”定义为早上8:00到晚上7:59。我将要与当前时间戳进行比较的过去日期总是比现在的时间短24小时 我该怎么做?白天时间=(#从今天到最后一天的天数)*12)+(今天白天时间的天数)+(最后一天白天时间的天数) 夜间时间=((从今天到最后一天的天数)*12)+(今天的夜间时间)+(最后一天的夜间时间) 编辑 int dthours = 0, nthours = 0; dthours +
int dthours = 0, nthours = 0;
dthours += ternary with a calculation of 24 - starthour logic for daytime
nthours += ternary with a calculation of 24 - starthour logic for nighttime
dthours += ternary with a calculation of endhour logic for daytime
nthours += ternary with a calculation of endhour logic for nighttime
明天夜间的逻辑如下所示:
nthours += (endhour - 4 > 0) ? ((endhour - 16 > 0) ? endhour - 12 : 4) : endhour;
白天时间=(#从今天到最后一天的天数)*12)+(今天白天时间的天数)+(最后一天白天时间的天数)
夜间时间=((从今天到最后一天的天数)*12)+(今天的夜间时间)+(最后一天的夜间时间)
编辑
int dthours = 0, nthours = 0;
dthours += ternary with a calculation of 24 - starthour logic for daytime
nthours += ternary with a calculation of 24 - starthour logic for nighttime
dthours += ternary with a calculation of endhour logic for daytime
nthours += ternary with a calculation of endhour logic for nighttime
明天夜间的逻辑如下所示:
nthours += (endhour - 4 > 0) ? ((endhour - 16 > 0) ? endhour - 12 : 4) : endhour;
当您开始处理夏令时之类的问题时,这会很快变得复杂,因此您确实需要使用当前日历并使用日历/日期函数来计算时差 例如,如果时钟在凌晨3:00向前移动1小时,根据您的定义,在时间更改的当天,您应该有11小时的“夜间”(而不是12小时) 我还没有完全测试过这段代码,但应该非常接近:
// 8:00:00 AM in seconds
static const NSTimeInterval daytimeStart = 28800;
// 8:00:00 PM in seconds
static const NSTimeInterval daytimeStop = 72000;
// Convert date to a "time" which is the number of seconds since midnight, NOT considering time changes
- (NSTimeInterval)getTimeForDate:(NSDate *)date {
NSCalendar *cal = [NSCalendar currentCalendar];
NSDateComponents *dateComps = [cal components:NSHourCalendarUnit |
NSMinuteCalendarUnit |
NSSecondCalendarUnit
fromDate:date];
NSTimeInterval time = dateComps.hour * 3600 + dateComps.minute * 60 + dateComps.second;
return time;
}
// Set the time to the specified hour and minutes/seconds to 0
- (NSDate *)dateBySettingTimeToBeginningOfHour:(NSUInteger)hour ofDate:(NSDate *)date {
NSCalendar *cal = [NSCalendar currentCalendar];
NSDateComponents *dateComps = [cal components:NSYearCalendarUnit |
NSMonthCalendarUnit |
NSDayCalendarUnit |
NSHourCalendarUnit |
NSMinuteCalendarUnit |
NSSecondCalendarUnit
fromDate:date];
[dateComps setHour:hour];
[dateComps setMinute:0];
[dateComps setSecond:0];
NSDate *newDate = [cal dateFromComponents:dateComps];
return newDate;
}
// Add one day to the current date
- (NSDate *)dateByAddingOneDayToDate:(NSDate *)date {
NSCalendar *cal = [NSCalendar currentCalendar];
NSDateComponents *dateComps = [cal components:NSYearCalendarUnit |
NSMonthCalendarUnit |
NSDayCalendarUnit |
NSHourCalendarUnit |
NSMinuteCalendarUnit |
NSSecondCalendarUnit
fromDate:date];
[dateComps setDay:[dateComps day] + 1];
NSDate *newDate = [cal dateFromComponents:dateComps];
return newDate;
}
// Check to see if it is daytime
- (BOOL)isDayForDate:(NSDate *)date {
NSTimeInterval time = [self getTimeForDate:date];
if (time >= daytimeStart) {
if (time < daytimeStop) {
return YES;
}
}
// Default
return NO;
}
// Check to see if it is night
- (BOOL)isNightForDate:(NSDate *)date {
return ![self isDayForDate:date];
}
// When do we transition from day to night or night to day next?
- (NSDate *)dateForNextTransitionForDate:(NSDate *)date {
NSTimeInterval time = [self getTimeForDate:date];
if (time < daytimeStart) {
return [self dateBySettingTimeToBeginningOfHour:8 ofDate:date];
}
if (time < daytimeStop) {
return [self dateBySettingTimeToBeginningOfHour:20 ofDate:date];
}
// Tomorrow morning
NSDate *newDate = [self dateByAddingOneDayToDate:date];
newDate = [self dateBySettingTimeToBeginningOfHour:8 ofDate:newDate];
return newDate;
}
- (NSTimeInterval)nightTimeFromDate:(NSDate *)startingDate toDate:(NSDate *)laterDate {
if ([startingDate compare:laterDate] != NSOrderedAscending) {
return 0;
}
NSTimeInterval nightTime = 0;
NSDate *now = laterDate;
NSDate *transitionDate = startingDate;
NSDate *loopDate = startingDate;
BOOL isNight = [self isNightForDate:startingDate];
do {
transitionDate = [self dateForNextTransitionForDate:transitionDate];
if ([transitionDate compare:now] == NSOrderedDescending) {
transitionDate = now;
}
if (isNight) {
nightTime = nightTime + [transitionDate timeIntervalSinceDate:loopDate];
}
loopDate = transitionDate;
isNight = !isNight;
} while ([transitionDate compare:now] != NSOrderedSame);
return nightTime;
}
- (NSTimeInterval)dayTimeFromDate:(NSDate *)startingDate toDate:(NSDate *)laterDate {
if ([startingDate compare:laterDate] != NSOrderedAscending) {
return 0;
}
NSTimeInterval diff = [laterDate timeIntervalSinceDate:startingDate];
diff = diff - [self nightTimeFromDate:startingDate toDate:laterDate];
return diff;
}
// Example usage:
NSDate *now = [NSDate date];
NSDate *date = [NSDate dateWithTimeInterval:-82800 sinceDate:now];
NSLog(@"%f", [self nightTimeFromDate:date toDate:now]);
NSLog(@"%f", [self dayTimeFromDate:date toDate:now]);
// Results are 43200.000000 and 39600.000000 right now in the middle of the day.
//上午8:00:00秒
静态常量NSTimeInterval daytimeStart=28800;
//晚上8:00:00秒
静态常数NSTimeInterval daytimeStop=72000;
//将日期转换为“时间”,即自午夜起的秒数,不考虑时间变化
-(NSTimeInterval)getTimeForDate:(NSDate*)日期{
NSCalendar*cal=[NSCalendar当前日历];
NSDateComponents*dateComps=[cal components:NSHourCalendarUnit |
n分钟日历单位|
第二日历单元
fromDate:日期];
NSTimeInterval time=dateComps.hour*3600+dateComps.minute*60+dateComps.second;
返回时间;
}
//将时间设置为指定的小时,将分/秒设置为0
-(NSDate*)日期设置时间:小时:(NSUPINTEGER)日期小时:(NSDate*)日期{
NSCalendar*cal=[NSCalendar当前日历];
NSDateComponents*dateComps=[cal components:NSYearCalendarUnit|
NSMonthCalendarUnit|
国家统计局日历单位|
恩绍尔日历单位|
n分钟日历单位|
第二日历单元
fromDate:日期];
[dateComps设置小时:小时];
[dateComps设置分钟:0];
[dateComps设置秒:0];
NSDate*newDate=[cal dateFromComponents:dateComps];
返回newDate;
}
//将一天添加到当前日期
-(NSDate*)日期由Addingonedaytodate:(NSDate*)日期{
NSCalendar*cal=[NSCalendar当前日历];
NSDateComponents*dateComps=[cal components:NSYearCalendarUnit|
NSMonthCalendarUnit|
国家统计局日历单位|
恩绍尔日历单位|
n分钟日历单位|
第二日历单元
fromDate:日期];
[dateComps setDay:[dateComps day]+1];
NSDate*newDate=[cal dateFromComponents:dateComps];
返回newDate;
}
//看看是不是白天
-(BOOL)isDayForDate:(NSDate*)日期{
NSTimeInterval time=[self-getTimeForDate:date];
如果(时间>=daytimeStart){
如果(时间