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Source for wiki TimeCowan version 4

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TimeCowan

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== Time ==

`(current-time)`

Returns a rational number representing the current number of milliseconds (excluding milliseconds during a leap second) since the Posix Epoch, which is 00:00:00 on 1 January 1970, Coordinated Universal Time.  Implementations SHOULD return a value that is as precise and accurate as possible.  Implementations MAY return exact or inexact values, and SHOULD return inexact values unless:

 * The value is an integer.
 * The range of most-efficiently-implemented exact integers in the implementation exceeds the integer range of inexact rationals.

In practice this means that implementations with fixnums greater than 2^53^ should return fixnums unless they have time-of-day clocks that provide more than 1 ms precision, and all other implementations should return IEEE 64-bit floats.

== Advanced Time (WG2) ==

See TimeAdvancedCowan.

== Time Durations and Periods (WG2) ==

See TimePeriodsCowan.

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2010-11-09 05:12:04