/* REXX LDOW determine n-th weekday of the month Written by Frank Clarke 20031002 Impact Analysis . SYSPROC TRAPOUT Modification History 20040120 fxc REXXSKEL to v.20040120; 20050110 fxc correct error message; 20050125 fxc enable STACK */ arg argline address TSO /* REXXSKEL ver.20040120 */ arg parms "((" opts signal on syntax signal on novalue call TOOLKIT_INIT /* conventional start-up -*/ rc = Trace("O"); rc = Trace(tv) info = parms /* to enable parsing */ call A_INIT /* -*/ call B_CALC /* -*/ retdate = result if retdate = 0 then, if \sw.0terse then, msg = "There is no matching date in" ccyy"/"monum else msg = 0 else do /* Example using 3TU200307 */ cardinal = WordPos(seq,"1 2 3 4 5 L") /* 3 (for 3rd) */ ordinal = Word(ordlist,cardinal) /* rd */ daypoint = WordPos(dow,daylist) /* 3 (TU) */ dayname = Word(daynames,daypoint) /* Tuesday */ parse var mo ccyy 5 monum . /* 2003 07 */ mthname = Word(mthlist,monum) /* July (7th month) */ msg = "The" seq""ordinal dayname "of" mthname"," ccyy, "is" ccyy"-"monum"-"Right(result,2,0) if sw.0terse then , msg = ccyy"-"monum"-"Right(result,2,0) end push msg /* */ if \sw.stack_ret then call DUMP_QUEUE("QUIET") /* -*/ exit /*@ LDOW */ /* Initialization . ----------------------------------------------------------------- */ A_INIT: /*@ */ if branch then call BRANCH address TSO result = 0 ordlist = "st nd rd th th ast" daylist = "SU MO TU WE TH FR SA SU MO TU WE TH FR SA" daynames = "Sunday Monday Tuesday Wednesday Thursday Friday", "Saturday" mthlist = "January February March April May June", "July August September October November December" days. = 31 /* jan mar may jul aug oct dec*/ days.02 = 28 /* feb */ days.04 = 30 /* apr */ days.06 = 30 /* jun */ days.09 = 30 /* sep */ days.11 = 30 /* nov */ sw.0Terse = SWITCH("TERSE") return /*@ A_INIT */ /* . ----------------------------------------------------------------- */ B_CALC: /*@ */ if branch then call BRANCH address TSO today = Date("S") /* 20030923 */ parse var today ccyy 5 mm 7 dd . parse var info tag . /* 3TH200308 */ parse var tag seq 2 dow 4 mo . /* 3 TH 200308 */ if WordPos(seq,"1 2 3 4 5 L") = 0 then do helpmsg =, "The 1st character of the parm must be 1 through 5 or L", "designating the n-th or Last weekday of the month." call HELP /* ...and don't come back */ end /* bad seq */ if Length(mo) = 6 then do /* req for specific year */ end else, if Length(mo) = 2 then do /* req for this year */ if mm > mo then ccyy = ccyy + 1 /* calc for next year */ mo = ccyy""mo end else do /* not 2 or 6 */ helpmsg =, "Parm must be either 5 or 9 characters consisting of", "a single digit (or L) plus a two-character day", "plus an optional 4-digit year", "plus a 2-digit month." call HELP /* ...and don't come back */ end monum = Right(mo,2) days.02 = 28 + (ccyy//4=0) - (ccyy//100=0) + (ccyy//400=0) base_start = Date("B",mo""01,"S") day_start = Left( Date("W",base_start,"B") ,2) upper day_start point = WordPos(day_start,daylist) /* starting point */ target = WordPos(dow,daylist,point) offset = target - point /* could be zero to 6 */ datelist = "" date = 1 + offset /* date of 1st xxxday */ do while(date <= days.monum) datelist = datelist date date = date + 7 end /* date */ /* datelist now contains the dates of all the xxxdays in the month*/ if seq = "L" then, /* Last */ date = Word(datelist,Words(datelist)) else, if seq > Words(datelist) then date = 0 else, date = Word(datelist,seq) return(date) /*@ B_CALC */ /* . ----------------------------------------------------------------- */ LOCAL_PREINIT: /*@ customize opts */ address TSO sw.stack_ret = SWITCH("STACK") return /*@ LOCAL_PREINIT */ /* subroutines below LOCAL_PREINIT are not selected by SHOWFLOW */ /* . ----------------------------------------------------------------- */ HELP: /*@ */ address TSO;"CLEAR" ; say "" if helpmsg <> "" then do ; say helpmsg; say ""; end ex_nam = Left(exec_name,8) /* predictable size */ say " "ex_nam" calculates the n-th day of a given month. " say " " say " Syntax: "ex_nam" " say " " say " (( " say " " say " identifier specifies the answer to be returned. It is in " say " the form: #DDyyyyMM where: " say " # is the week of the month: 1 2 3 4 5 or L (last) " say " DD is the day-abbreviation: SU MO TU WE TH FR SA " say " yyyy is an optional 4-digit year " say " MM is the 2-digit month, 01-12 " say " " say " Thus, 3TU200306 is the 3rd Tuesday of June, 2003. " say " LFR12 is the last Friday of the December to come " say " (or this month if called in December). " say " " say " TERSE returns only the ISO-date for the identifier. If no" say " date qualifies, '0' is returned. " say " " say " STACK causes" exec_name "to return its answer by pushing " say " it onto the stack. " say " " "NEWSTACK"; pull ; "CLEAR" ; "DELSTACK" say " " say " Debugging tools provided include: " say " " say " BRANCH: show all paragraph entries. " say " " say " TRACE tv: will use value following TRACE to place the " say " execution in REXX TRACE Mode. " say " " say " " say " Debugging tools can be accessed in the following manner: " say " " say " TSO "ex_nam" parameters (( debug-options " say " " say " For example: " say " " say " TSO "ex_nam" (( MONITOR TRACE ?R " if sw.inispf then, address ISPEXEC "CONTROL DISPLAY REFRESH" exit /*@ HELP */ /* REXXSKEL back-end removed to save space */