第一种方式：
NSTimeInterval time = ...;
NSString *string = [NSString stringWithFormat:@"%02li:%02li:%02li",
lround(floor(time / 3600.)) % 100,
lround(floor(time / 60.)) % 60,
lround(floor(time.)) % 60];
第二种方式：
// You could also have stored the start time using
// CFAbsoluteTimeGetCurrent()
NSTimeInterval elapsedTime = [startDate timeIntervalSinceNow];
// Divide the interval by 3600 and keep the quotient and remainder
div_t h = div(elapsedTime, 3600);
int hours = h.quot;
// Divide the remainder by 60; the quotient is minutes, the remainder
// is seconds.
div_t m = div(h.rem, 60);
int minutes = m.quot;
int seconds = m.rem;
// If you want to get the individual digits of the units, use div again
// with a divisor of 10.
NSLog(@"%d:%d:%d", hours, minutes, seconds)
如果您有您初始日期存储在 NSDate 对象时，您可以获得新日期任何时间间隔在未来。只需使用 dateByAddingTimeInterval: 像这样：
NSDate * originalDate = [NSDate date];
NSTimeInterval interval = 1;
NSDate * futureDate = [originalDate dateByAddingTimeInterval:interval];
ios获取自1970年以来的毫秒数同java的System.currentTimeMillis()
NSTimeInterval time = ...;
NSString *string = [NSString stringWithFormat:@"%02li:%02li:%02li",
lround(floor(time / 3600.)) % 100,
lround(floor(time / 60.)) % 60,
lround(floor(time.)) % 60];
第二种方式：
// You could also have stored the start time using
// CFAbsoluteTimeGetCurrent()
NSTimeInterval elapsedTime = [startDate timeIntervalSinceNow];
// Divide the interval by 3600 and keep the quotient and remainder
div_t h = div(elapsedTime, 3600);
int hours = h.quot;
// Divide the remainder by 60; the quotient is minutes, the remainder
// is seconds.
div_t m = div(h.rem, 60);
int minutes = m.quot;
int seconds = m.rem;
// If you want to get the individual digits of the units, use div again
// with a divisor of 10.
NSLog(@"%d:%d:%d", hours, minutes, seconds)
如果您有您初始日期存储在 NSDate 对象时，您可以获得新日期任何时间间隔在未来。只需使用 dateByAddingTimeInterval: 像这样：
NSDate * originalDate = [NSDate date];
NSTimeInterval interval = 1;
NSDate * futureDate = [originalDate dateByAddingTimeInterval:interval];
ios获取自1970年以来的毫秒数同java的System.currentTimeMillis()
Java代码
- + (NSString*)generateTimeIntervalWithTimeZone
- {
- NSMutableString *result = [[NSMutableString alloc] init];
- NSDate *date = [NSDate date];
- NSTimeInterval time = [date timeIntervalSince1970]*1000;//毫秒数要乘以1000
- double i=time; //NSTimeInterval返回的是double类型
- NSDateFormatter *format = [[NSDateFormatter alloc] init];
- [format setDateFormat:@"Z"];
- NSString *timeZone = [format stringFromDate:date];
- NSString *timeIntervalStr = [NSString stringWithFormat:@"%.f", i];
- [result appendString:timeIntervalStr];
- [result appendString:timeZone];
- return result;
- }
