ios 在 iPhone 上检索当前本地时间？
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Retrieving current local time on iPhone?
提问by user21293
I'm looking to get the current hour and minute on a user's iPhone for display in an app that doesn't show the status bar. Is there a simple way to do this?
我希望在用户的 iPhone 上获取当前的小时和分钟，以便在不显示状态栏的应用程序中显示。有没有一种简单的方法可以做到这一点？
回答by mixolution
// get current date/time
NSDate *today = [NSDate date];
NSDateFormatter *dateFormatter = [[NSDateFormatter alloc] init];
// display in 12HR/24HR (i.e. 11:25PM or 23:25) format according to User Settings
[dateFormatter setTimeStyle:NSDateFormatterShortStyle];
NSString *currentTime = [dateFormatter stringFromDate:today];
[dateFormatter release];
NSLog(@"User's current time in their preference format:%@",currentTime);
回答by Nitin Malguri
-(void)currentTime
{
//Get current time
NSDate* now = [NSDate date];
NSCalendar *gregorian = [[NSCalendar alloc] initWithCalendarIdentifier:NSCalendarIdentifierGregorian];
NSDateComponents *dateComponents = [gregorian components:(NSCalendarUnitHour | NSCalendarUnitMinute | NSCalendarUnitSecond) fromDate:now];
NSInteger hour = [dateComponents hour];
NSString *am_OR_pm=@"AM";
if (hour>12)
{
hour=hour%12;
am_OR_pm = @"PM";
}
NSInteger minute = [dateComponents minute];
NSInteger second = [dateComponents second];
[gregorian release];
NSLog(@"Current Time %@",[NSString stringWithFormat:@"%02ld:%02ld:%02ld %@", (long)hour, (long)minute, (long)second,am_OR_pm]);
}
回答by ZYiOS
NSDateFormatter *dateFormatter = [[NSDateFormatter alloc] init];
[dateFormatter setDateStyle:NSDateFormatterMediumStyle];
[dateFormatter setTimeStyle:NSDateFormatterMediumStyle];
[dateFormatter setTimeZone:[NSTimeZone localTimeZone]];
NSString *currentTime = [dateFormatter stringFromDate:[NSDate date]]
[dateFormatter release]; dateFormatter = nil;
I think you should try this. The timeZone is important.
我想你应该试试这个。时区很重要。
回答by Chris Ballance
回答by Vinay W
if you are looking to calculate time intervals, you are better off using CACurrentMediaTime
如果您想计算时间间隔，最好使用CACurrentMediaTime
double currentTime = CACurrentMediaTime();
回答by Jim75
A shorter approach
更短的方法
NSDate * now = [NSDate date];
timeLabel.text = [NSDateFormatter localizedStringFromDate:now
dateStyle:NSDateFormatterNoStyle
timeStyle:NSDateFormatterShortStyle];
回答by Inder Kumar Rathore
CFAbsoluteTimeGetCurrent()
CFAbsoluteTimeGetCurrent()
Absolute time is measured in seconds relative to the absolute reference date of Jan 1 2001 00:00:00 GMT. A positive value represents a date after the reference date, a negative value represents a date before it. For example, the absolute time -32940326 is equivalent to December 16th, 1999 at 17:54:34. Repeated calls to this function do not guarantee monotonically increasing results. The system time may decrease due to synchronization with external time references or due to an explicit user change of the clock.
相对于 2001 年 1 月 1 日 00:00:00 GMT 的绝对参考日期，以秒为单位测量绝对时间。正值表示参考日期之后的日期，负值表示参考日期之前的日期。例如，绝对时间 -32940326 相当于 1999 年 12 月 16 日 17:54:34。重复调用此函数并不能保证单调递增的结果。由于与外部时间参考同步或由于用户明确更改时钟，系统时间可能会减少。
