20200714--iOS之TimeInterval类型别名，表示时间戳间隔的Double别名

Type Alias

TimeInterval

A number of seconds.

秒数

 

Declaration

typealias TimeInterval = Double

Discussion

A TimeInterval value is always specified in seconds; it yields sub-millisecond precision over a range of 10,000 years.

--时间间隔值始终以秒为单位指定;它能在一万年的时间内产生亚毫秒级的精度。

On its own, a time interval does not specify a unique point in time, or even a span between specific times. Combining a time interval with one or more known reference points yields a Date or DateInterval value.

--就其本身而言，时间间隔并不指定惟一的时间点，甚至也不指定特定时间之间的跨度。将时间间隔与一个或多个已知参考点组合在一起，就会产生一个日期或日期间隔值。

See Also

Date Representations

struct Date

A specific point in time, independent of any calendar or time zone.

struct DateInterval

The span of time between a specific start date and end date.