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67 lines
2.1 KiB
Scheme
67 lines
2.1 KiB
Scheme
;;;; "cltime.scm" Common-Lisp time conversion routines.
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;;; Copyright (C) 1994, 1997 Aubrey Jaffer.
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;
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;Permission to copy this software, to redistribute it, and to use it
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;for any purpose is granted, subject to the following restrictions and
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;understandings.
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;
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;1. Any copy made of this software must include this copyright notice
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;in full.
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;
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;2. I have made no warrantee or representation that the operation of
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;this software will be error-free, and I am under no obligation to
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;provide any services, by way of maintenance, update, or otherwise.
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;
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;3. In conjunction with products arising from the use of this
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;material, there shall be no use of my name in any advertising,
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;promotional, or sales literature without prior written consent in
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;each case.
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(require 'values)
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(require 'time-zone)
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(require 'posix-time)
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(define time:1900 (time:invert time:gmtime '#(0 0 0 1 0 0 #f #f 0 0 "GMT")))
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(define (get-decoded-time)
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(decode-universal-time (get-universal-time)))
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(define (get-universal-time)
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(difftime (current-time) time:1900))
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(define (decode-universal-time utime . tzarg)
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(let ((tv (apply time:split
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(offset-time time:1900 utime)
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(if (null? tzarg)
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(tz:params utime (tzset))
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(list 0 (* 3600 (car tzarg)) "???")))))
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(values
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(vector-ref tv 0) ;second [0..59]
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(vector-ref tv 1) ;minute [0..59]
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(vector-ref tv 2) ;hour [0..23]
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(vector-ref tv 3) ;date [1..31]
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(+ 1 (vector-ref tv 4)) ;month [1..12]
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(+ 1900 (vector-ref tv 5)) ;year [0....]
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(modulo (+ -1 (vector-ref tv 6)) 7) ;day-of-week [0..6] (0 is Monday)
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(eqv? 1 (vector-ref tv 8)) ;daylight-saving-time?
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(if (provided? 'inexact)
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(inexact->exact (/ (vector-ref tv 9) 3600))
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(/ (vector-ref tv 9) 3600)) ;time-zone [-24..24]
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)))
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(define (encode-universal-time second minute hour date month year . tzarg)
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(let* ((tz (if (null? tzarg)
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(tzset)
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(time-zone (string-append
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"???" (number->string (car tzarg))))))
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(tv (vector second
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minute
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hour
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date
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(+ -1 month)
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(+ -1900 year)
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#f ;ignored
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#f ;ignored
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)))
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(difftime (time:invert localtime tv) time:1900)))
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