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210 lines
6.0 KiB
Plaintext
210 lines
6.0 KiB
Plaintext
5 years ago
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C
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C ANALYST : D.GORHAM
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C INDEX NO. : UT 95.00
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C TITLE : EXTENDED GREGORIAN DATE SUBROUTINE FROM YEAR 1/1/1
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C DATE : 08/03/82
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C REV.01 : 19-SEP-83 BY DJG: MODIFIED FOR VAX
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C
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C THIS SUBROUTINE IS ADAPTED BY DJG FROM THAT IN HP COMMUNICATOR
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C 1981 VOL. 5 ISSUE 3 WITH INTEGER*4 TYPE BEING CHANGED TO REAL
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C PLUS ASSOCIATED CHANGES.
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C
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C PARAMETER LIST :
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C OPT = 1 TO CONVERT CALENDAR DATE TO EXTENDED GREGORIAN DATE (EGD)
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C = 2 TO CONVERT EXTENDED GREGORIAN DATE (EGD) TO CALENDAR DATE
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C MON = MONTH (1-12)
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C DAY = DAY OF MONTH
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C YEAR= CALENDAR YEAR EG. 1982
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C DWK = DAY OF WEEK (1=SUNDAY, 7=SATURDAY)
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C DYR = DAY OF YEAR
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C DMON= DAYS IN MONTH
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C EGD = EXTENDED GREGORIAN DATE SINCE 1/1/1
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C IER = 0 FOR NO ERRORS
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C 1 IF ERRORS DETECTED
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C LU = 0 FOR NO ERROR MESSAGE PRINTOUT
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C = N FOR DISPLAY OF ERROR MESSAGE ON LOGICAL UNIT 'N'
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C
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C TITLE TRUE GEORGIAN DATE ROUTINE ISS. 2 801126 R.A.G. (MWR)
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C
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SUBROUTINE GDATE (OPT,MON,DAY,YEAR,DWK,DYR,DMON,EGD,IER,LU)
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C
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C GREGORIAN DATE ROUTINE 801126
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C
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IMPLICIT INTEGER*4 (A-Z)
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C
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C
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C --------------------------------------------------------------
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C
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C REVISION LIST
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C
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C --DATE-- ---BY--- --DESCRIPTION--
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C
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C 19/03/80 R.A.G. -ORIGINAL ISSUE
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C 26/11/80 R.A.G. -CONVERTED REAL NUMBERS TO DOUBLE INTEGER AND
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C ADDED DAY OF THE WEEK, DAY OF THE YEAR (JULIAN
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C DATE), AND NUMBER OF DAYS IN THE MONTH.
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C
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C ---------------------------------------------------------------
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C
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C
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INTEGER*4 M(12)
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C
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LOGICAL LYEAR
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C
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DATA M/31,28,31,30,31,30,31,31,30,31,30,31/
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C
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C INITIALIZE SOME VARIABLES
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C
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M(2)=28
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DYR=0
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IER=0
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C
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C CHECK FOR OPTION
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C 1=CALLER SUPPLIES DAY MONTH YEAR
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C >1=CALLER SUPPLIES EXTENDED GREGORIAN DATE
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C
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IF (OPT.GT.1) GO TO 120
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C
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C THIS SECTION CONVERTS TO A GREGORIAN DATE
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C
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C TEST ARGUMENTS FOR VALIDITY
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C
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IF (MON.LT.1.OR.MON.GT.12.OR.DAY.LT.1.OR.DAY.GT.31.
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1 OR.YEAR.LT.1) THEN
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cdrc TYPE 5000
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PRINT 5000
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5000 FORMAT(' **GDATE ERROR')
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cdrc TYPE '(A,I6)',' MONTH =',MON
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cdrc TYPE '(A,I6)',' DAY =',DAY
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cdrc TYPE '(A,I6)',' YEAR =',YEAR
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PRINT '(A,I6)',' MONTH =',MON
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PRINT '(A,I6)',' DAY =',DAY
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PRINT '(A,I6)',' YEAR =',YEAR
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IER=1
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GO TO 180
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END IF
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C
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IF (LYEAR(YEAR)) M(2)=29
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C
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IF (DAY.GT.M(MON)) THEN
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cdrc TYPE 5000
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cdrc TYPE '(A,I6)',' DAY =',DAY
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PRINT 5000
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PRINT '(A,I6)',' DAY =',DAY
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IER=2
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GO TO 180
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END IF
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C
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C CALCULATE GREG. DATE TO 1ST OF REQUESTED YEAR
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C
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Y=YEAR-1
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EGD=GDATS(Y)
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C
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C CALCULATE TO CURRENT GREGORIAN DATE
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C
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J=MON-1
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IF (J.EQ.0) GO TO 110
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DO 100 I=1,J
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DYR=DYR+M(I)
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100 CONTINUE
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EGD=EGD+DYR
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110 EGD=EGD+DAY
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DYR=DYR+DAY
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GO TO 170
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C
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C THIS SECTION CONVERTS FROM A GREGORIAN DATE
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C
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120 IF (EGD.LT.1) THEN
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IER=3
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cdrc TYPE 5000
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cdrc TYPE '(A,I6)',' EGD =',EGD
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PRINT 5000
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PRINT '(A,I6)',' EGD =',EGD
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GO TO 180
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END IF
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C
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C CALCULATE CURRENT DATE (DD/MM/YYYY)
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C
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YEAR=(EGD/366)-1
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130 YEAR=YEAR+1
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EEGD=GDATS(YEAR)
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IF (EGD-EEGD-368) 140,140,130
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140 YEAR=YEAR+1
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DYR=EGD-EEGD
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C
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IF (LYEAR(YEAR)) M(2)=29
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C
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DO 150 MON=1,12
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EEGD=EEGD+M(MON)
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IF (EGD.LE.EEGD) GO TO 160
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150 CONTINUE
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M(2)=28
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GO TO 140
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C
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C CALCULATE THE REMAINING ARGUMENTS
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C
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160 DAY=EGD+M(MON)-EEGD
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170 DMON=M(MON)
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DWK=MOD(EGD,7)+1
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RETURN
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C
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180 RETURN
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END
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C
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C
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C TITLE FUNCTION LYEAR(LEAP YEAR) ISS. 1 801126 R.A.G. (MWR)
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FUNCTION LYEAR(YEAR)
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C
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IMPLICIT INTEGER*4 (A-Z)
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C
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C THIS FUNCTION WILL TEST A GIVEN YEAR AND RETURN A TRUE/FALSE
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C INDICATION
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C
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C --------------------------------------------------------------
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C
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C REVISION LIST
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C
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C --DATE-- ---BY--- --DESCRIPTION--
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C
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C 26/11/80 R.A.G. -ORIGINAL ISSUE
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C
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C --------------------------------------------------------------
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C
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LYEAR=0
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IF (MOD(YEAR,4).EQ.0.AND.MOD(YEAR,100).NE.0.OR.
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& MOD(YEAR,400).EQ.0) LYEAR= -1
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RETURN
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END
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C TITLE FUNCTION GDATS(GDATE) ISS. 1 801126 R.A.G. (MWR)
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FUNCTION GDATS(YEAR)
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C
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C
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IMPLICIT INTEGER*4 (A-Z)
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C
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C
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C THIS FUNCTION IS PART OF THE GDATE SUBROUTINE, AND RETURNS A
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C GREGORIAN DATE TO THE 1ST OF THE YEAR BASED ON THAT YEAR
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C
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C -----------------------------------------------------------------
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C
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C REVISION LIST
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C
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C --DATE-- ---BY--- --DESCRIPTION
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C
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C 26/11/80 R.A.G. -ORIGINAL ISSUE
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C
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C --------------------------------------------------------------------
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C
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C **NOTE**
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C
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C GDATS MUST BE DECLARED AS AN INTEGER*4 FUNCTION!!!!!!!
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C
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CON=365
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GDATS=CON*YEAR
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GDATS=GDATS+(24*(YEAR/100))
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GDATS=GDATS+(YEAR/400)
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GDATS=GDATS+(MOD(YEAR,100)/4)
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RETURN
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END
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