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Time
====

 - primitive: current-time
     Returns the number of seconds since 1970-01-01 00:00:00 UTC,
     excluding leap seconds.

 - primitive: gettimeofday
     Returns a pair containing the number of seconds and microseconds
     since 1970-01-01 00:00:00 UTC, excluding leap seconds.  Note:
     whether true microsecond resolution is available depends on the
     operating system.

The following procedures either accept an object representing a broken
down time and return a selected component, or accept an object
representing a broken down time and a value and set the component to
the value.  The numbers in parentheses give the usual range.

`tm:sec, set-tm:sec'
     Seconds (0-59).

`tm:min, set-tm:min'
     Minutes (0-59).

`tm:hour, set-tm:hour'
     Hours (0-23).

`tm:mday, set-tm:mday'
     Day of the month (1-31).

`tm:mon, set-tm:mon'
     Month (0-11).

`tm:year, set-tm:year'
     Year (70-), the year minus 1900.

`tm:wday, set-tm:wday'
     Day of the week (0-6) with Sunday represented as 0.

`tm:yday, set-tm:yday'
     Day of the year (0-364, 365 in leap years).

`tm:isdst, set-tm:isdst'
     Daylight saving indicator (0 for "no", greater than 0 for "yes",
     less than 0 for "unknown").

`tm:gmtoff, set-tm:gmtoff'
     Time zone offset in seconds west of UTC (-46800 to 43200).

`tm:zone, set-tm:zone'
     Time zone label (a string), not necessarily unique.

 - primitive: localtime time [zone]
     Returns an object representing the broken down components of TIME,
     an integer like the one returned by `current-time'.  The time zone
     for the calculation is optionally specified by ZONE (a string),
     otherwise the `TZ' environment variable or the system default is
     used.

 - primitive: gmtime time
     Returns an object representing the broken down components of TIME,
     an integer like the one returned by `current-time'.  The values
     are calculated for UTC.

 - primitive: mktime sbd_time [zone]
     BD-TIME is an object representing broken down time and `zone' is
     an optional time zone specifier (otherwise the TZ environment
     variable or the system default is used).

     Returns a pair: the CAR is a corresponding integer time value like
     that returned by `current-time'; the CDR is a broken down time
     object, similar to as BD-TIME but with normalized values.

 - primitive: tzset
     Initialize the timezone from the TZ environment variable or the
     system default.  It's not usually necessary to call this procedure
     since it's done automatically by other procedures that depend on
     the timezone.

 - primitive: strftime format stime
     Formats a time specification TIME using TEMPLATE.  TIME is an
     object with time components in the form returned by `localtime' or
     `gmtime'.  TEMPLATE is a string which can include formatting
     specifications introduced by a `%' character.  The formatting of
     month and day names is dependent on the current locale.  The value
     returned is the formatted string.  *Note Formatting Date and Time:
     (libc)Formatting Date and Time.)

 - primitive: strptime format string
     Performs the reverse action to `strftime', parsing STRING
     according to the specification supplied in TEMPLATE.  The
     interpretation of month and day names is dependent on the current
     locale.  The value returned is a pair.  The CAR has an object with
     time components in the form returned by `localtime' or `gmtime',
     but the time zone components are not usefully set.  The CDR
     reports the number of characters from STRING which were used for
     the conversion.

 - Variable: internal-time-units-per-second
     The value of this variable is the number of time units per second
     reported by the following procedures.

 - primitive: times
     Returns an object with information about real and processor time.
     The following procedures accept such an object as an argument and
     return a selected component:

    `tms:clock'
          The current real time, expressed as time units relative to an
          arbitrary base.

    `tms:utime'
          The CPU time units used by the calling process.

    `tms:stime'
          The CPU time units used by the system on behalf of the
          calling process.

    `tms:cutime'
          The CPU time units used by terminated child processes of the
          calling process, whose status has been collected (e.g., using
          `waitpid').

    `tms:cstime'
          Similarly, the CPU times units used by the system on behalf of
          terminated child processes.

 - primitive: get-internal-real-time
     Returns the number of time units since the interpreter was started.

 - primitive: get-internal-run-time
     Returns the number of time units of processor time used by the
     interpreter.  Both "system" and "user" time are included but
     subprocesses are not.