This site is a static rendering of the Trac instance that was used by R7RS-WG1 for its work on R7RS-small (PDF), which was ratified in 2013. For more information, see Home. For a version of this page that may be more recent, see TimeCowan in WG2's repo for R7RS-large.

Time­Cowan

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2010-12-11 07:10:54
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Calendar Time

(current-posix-second)

Returns a rational number representing the current second of the Posix epoch, which began on 00:00:00 on 1 January 1970, Coordinated Universal Time but excludes all leap seconds. Implementations SHOULD return a value that:

If the implementation cannot provide such a value, either temporarily or permanently, when current-posix-seconds is invoked, it MUST return #f.

Elapsed Time

(current-jiffy)

Returns an exact integer representing the number of jiffies (arbitrary elapsed time units) since an arbitrary epoch, an implementation such as the time the program started running, the operating system was booted, or anything else. Leap seconds are not excluded. Implementations SHOULD return a value that:

If the implementation cannot provide such a value, either temporarily or permanently, when current-jiffy is invoked, it MUST return #f.

(jiffies-per-second)

Returns an exact integer representing the number of jiffies per SI second. This value is an implementation-specified constant.

Date and Time Arithmetic (WG2)

See TimeAdvancedCowan.

Time Durations and Periods (WG2)

See TimePeriodsCowan.

Time formatting (WG2)

See TimeFormattingCowan.