Subversion Repositories Kolibri OS

(*

    Copyright 2016, 2018 Anton Krotov

    This program is free software: you can redistribute it and/or modify

    it under the terms of the GNU Lesser General Public License as published by

    the Free Software Foundation, either version 3 of the License, or

    (at your option) any later version.

    This program is distributed in the hope that it will be useful,

    but WITHOUT ANY WARRANTY; without even the implied warranty of

    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the

    GNU Lesser General Public License for more details.

    You should have received a copy of the GNU Lesser General Public License

    along with this program.  If not, see .

*)

MODULE DateTime;

IMPORT KOSAPI;

CONST ERR* = -7.0E5;

PROCEDURE Encode*(Year, Month, Day, Hour, Min, Sec: INTEGER): REAL;

VAR d, i: INTEGER; M: ARRAY 14 OF CHAR; Res: REAL;

BEGIN

  Res := ERR;

  IF (Year >= 1) & (Year <= 9999) & (Month >= 1) & (Month <= 12) &

    (Day >= 1) & (Day <= 31) & (Hour >= 0) & (Hour <= 23) &

    (Min >= 0) & (Min <= 59) & (Sec >= 0) & (Sec <= 59) THEN

    M := "_303232332323";

    IF (Year MOD 4 = 0) & (Year MOD 100 # 0) OR (Year MOD 400 = 0) THEN

      M[2] := "1"

    END;

    IF Day <= ORD(M[Month]) - ORD("0") + 28 THEN

      DEC(Year);

      d := Year * 365 + (Year DIV 4) - (Year DIV 100) + (Year DIV 400) + Day - 693594;

      FOR i := 1 TO Month - 1 DO

        d := d + ORD(M[i]) - ORD("0") + 28

      END;

      Res := FLT(d) + FLT(Hour * 3600000 + Min * 60000 + Sec * 1000) / 86400000.0

    END

  END

  RETURN Res

END Encode;

PROCEDURE Decode*(Date: REAL; VAR Year, Month, Day, Hour, Min, Sec: INTEGER): BOOLEAN;

VAR Res, flag: BOOLEAN; d, t, i: INTEGER; M: ARRAY 14 OF CHAR;

  PROCEDURE MonthDay(n: INTEGER; VAR d, Month: INTEGER; M: ARRAY OF CHAR): BOOLEAN;

  VAR Res: BOOLEAN;

  BEGIN

    Res := FALSE;

    IF d > ORD(M[n]) - ORD("0") + 28 THEN

      d := d - ORD(M[n]) + ORD("0") - 28;

      INC(Month);

      Res := TRUE

    END

    RETURN Res

  END MonthDay;

BEGIN

  IF (Date >= -693593.0) & (Date < 2958466.0) THEN

    d := FLOOR(Date);

    t := FLOOR((Date - FLT(d)) * 86400000.0);

    d := d + 693593;

    Year := 1;

    Month := 1;

    WHILE d > 0 DO

      d := d - 365 - ORD((Year MOD 4 = 0) & (Year MOD 100 # 0) OR (Year MOD 400 = 0));

      INC(Year)

    END;

    IF d < 0 THEN

      DEC(Year);

      d := d + 365 + ORD((Year MOD 4 = 0) & (Year MOD 100 # 0) OR (Year MOD 400 = 0))

    END;

    INC(d);

    M := "_303232332323";

    IF (Year MOD 4 = 0) & (Year MOD 100 # 0) OR (Year MOD 400 = 0) THEN

      M[2] := "1"

    END;

    i := 1;

    flag := TRUE;

    WHILE flag & (i <= 12) DO

      flag := MonthDay(i, d, Month, M);

      INC(i)

    END;

    Day := d;

    Hour := t DIV 3600000;

    t := t MOD 3600000;

    Min := t DIV 60000;

    t := t MOD 60000;

    Sec := t DIV 1000;

    Res := TRUE

  ELSE

    Res := FALSE

  END

  RETURN Res

END Decode;

PROCEDURE Now*(VAR Year, Month, Day, Hour, Min, Sec, Msec: INTEGER);

VAR date, time: INTEGER;

BEGIN

  date  := KOSAPI.sysfunc1(29);

  time  := KOSAPI.sysfunc1(3);

  Year  := date MOD 16;

  date  := date DIV 16;

  Year  := (date MOD 16) * 10 + Year;

  date  := date DIV 16;

  Month := date MOD 16;

  date  := date DIV 16;

  Month := (date MOD 16) * 10 + Month;

  date  := date DIV 16;

  Day := date MOD 16;

  date  := date DIV 16;

  Day := (date MOD 16) * 10 + Day;

  date  := date DIV 16;

  Hour  := time MOD 16;

  time  := time DIV 16;

  Hour  := (time MOD 16) * 10 + Hour;

  time  := time DIV 16;

  Min := time MOD 16;

  time  := time DIV 16;

  Min := (time MOD 16) * 10 + Min;

  time  := time DIV 16;

  Sec := time MOD 16;

  time  := time DIV 16;

  Sec := (time MOD 16) * 10 + Sec;

  time  := time DIV 16;

  Year := Year + 2000;

  Msec := 0

END Now;

END DateTime.