The units module provides definitions for common units.
| Time | Time represents a duration of time in seconds, or the number of seconds since an arbitrary
epoch. Time is stored as an integer number of seconds plus any remaining fraction of a second
as a floating point value.
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| TimeBase | A TimeBase is the conversion factor between a TimeStamp and real-world seconds.
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| Duration | A Duration indicates a positive span of time.
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| TimeStamp | A TimeStamp represents an instantenous instant in time since the start of a stream. One
TimeStamp “tick” is equivalent to the stream’s TimeBase in seconds.
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