CFAbsoluteTime
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CFAbsoluteTime is useful when you need to refer to
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a specific point in time. A CFAbsoluteTime value represents time as a number of seconds relative to the
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reference date of 1
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January, 2001 00:00:00 GMT
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typedef CFTimeInterval CFAbsoluteTime;Discussion
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. A positive value represents a date after the reference date, a negative value represents a date before it.
Absolute time can be confusing at first because an absolute time value is literally a time interval (the number of seconds
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since the reference date
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Availability
- Available in Mac OS X v10.0 and later.
Declared In
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), but it is interpreted as a specific instant in time. For example, the absolute time -32940326 indicates both a date and time: December 16th, 1999 at 17:54:34. An absolute time value cannot be used to refer to a date or a clock time independently, it always includes both.