Source code in the algol programming language

BEGIN %   DISCORDIAN DATE CALCULATION - TRANSLATION OF MAD                %
    INTEGER          GREG, GMONTH, GDAY, GYEAR;
    STRING(16) ARRAY HOLY5  ( 0 ::  4 );
    STRING(16) ARRAY HOLY50 ( 0 ::  4 );
    STRING(16) ARRAY DISDAY ( 0 ::  4 );
    STRING(16) ARRAY DISSSN ( 0 ::  4 );
    INTEGER    ARRAY MLENGT ( 0 :: 12 );
    INTEGER          APOS;
    STRING(1)        SLASH1, SLASH2;

    % WRITES A "$" TERMINATED STRING                                      %
    PROCEDURE WRITEONTEXT( STRING(16) VALUE TEXT ) ;
    BEGIN
        INTEGER TPOS;
        TPOS := 0;
        WHILE TPOS < 16 DO BEGIN
            IF TEXT( TPOS // 1 ) = "$"
            THEN TPOS := 32
            ELSE WRITEON( TEXT( TPOS // 1 ) );
            ;
            TPOS := TPOS + 1
        END WHILE_TPOS_LT_16
    END WRITEONTEXT;

    APOS := 0;
    FOR M := 0,0,31,59,90,120,151,181,212,243,273,304,334 DO BEGIN MLENGT(APOS) := M; APOS := APOS + 1 END;
    HOLY5 (0) := "MUNG$";HOLY5 (1) := "MOJO$"; HOLY5 (2) := "SYA$";  HOLY5 (3) := "ZARA$"; HOLY5 (4) := "MALA$";
    HOLY50(0) := "CHAO$";HOLY50(1) := "DISCO$";HOLY50(2) := "CONFU$";HOLY50(3) := "BURE$"; HOLY50(4) := "AF$";
    DISDAY(0) := "SWEETMORN$";       DISDAY(1) := "BOOMTIME$";      DISDAY(2) := "PUNGENDAY$";
    DISDAY(3) := "PRICKLE-PRICKLE$"; DISDAY(4) := "SETTING ORANGE$";
    DISSSN(0) := "CHAOS$"; DISSSN(1) := "DISCORD$"; DISSSN(2) := "CONFUSION$";
    DISSSN(3) := "BUREAUCRACY$"; DISSSN(4) := "THE AFTERMATH$"; 

    % INPUT DATE SHOULD CONTAIN MM/DD/YYYY IN GREGORIAN CALENDAR          %
    READ( GMONTH, SLASH1, GDAY, SLASH2, GYEAR );  
 
    IF GMONTH = 2 AND GDAY = 29
    THEN WRITE( I_W := 4, S_W := 0, "SAINT TIB'S DAY IN THE Y.O.L.D. ", GYEAR + 1166 )
    ELSE BEGIN
        INTEGER YRDAY, SEASON, DAY, WKDAY;
        YRDAY  := MLENGT(GMONTH)+GDAY;
        SEASON := YRDAY DIV 73;
        DAY    := YRDAY-SEASON*73;
        WKDAY  := (YRDAY-1) REM 5;
        WRITEONTEXT( DISDAY(WKDAY) );
        WRITEON( S_W := 0, ", DAY ", I_W := 2, DAY, " OF " );
        WRITEONTEXT( DISSSN(SEASON) );
        WRITEON( S_W := 0, " IN THE Y.O.L.D ", I_W := 4, GYEAR + 1166 );
        IF      DAY = 5  THEN BEGIN
            WRITE( "CELEBRATE " );WRITEONTEXT( HOLY5(SEASON) );  WRITEON( "DAY"  )
            END
        ELSE IF DAY = 50 THEN BEGIN
            WRITE( "CELEBRATE " );WRITEONTEXT( HOLY50(SEASON) ); WRITEON( "FLUX" )
        END IF_FAY_EQ_5__DAY_EQ_50
    END
END.