Last Friday of each month: Difference between revisions
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The documentation for the '''lastDOW''' function (used in the REXX program below): |
The documentation for the '''lastDOW''' function (used in the REXX program below): |
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<pre> |
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╔════════════════════════════════════════════════════════════════════╗ |
╔════════════════════════════════════════════════════════════════════╗ |
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║ lastDOW: procedure to return the date of the last day─of─week of ║ |
║ lastDOW: procedure to return the date of the last day─of─week of ║ |
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║ then obtained straightforwardly, or via subtraction. ║ |
║ then obtained straightforwardly, or via subtraction. ║ |
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╚════════════════════════════════════════════════════════════════════╝ |
╚════════════════════════════════════════════════════════════════════╝ |
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</pre> |
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<lang rexx>/*REXX program displays the dates of the last Fridays of each month for any given year.*/ |
<lang rexx>/*REXX program displays the dates of the last Fridays of each month for any given year.*/ |
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parse arg yyyy /*obtain optional argument from the CL.*/ |
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parse arg yyyy |
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do j=1 for 12 |
do j=1 for 12 /*traipse through all the year's months*/ |
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say lastDOW('Friday', j, yyyy) /*find last Friday for the Jth month.*/ |
say lastDOW('Friday', j, yyyy) /*find last Friday for the Jth month.*/ |
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end /*j*/ |
end /*j*/ |
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exit /*stick a fork in it, we're all done. */ |
exit /*stick a fork in it, we're all done. */ |
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/*──────────────────────────────────────────────────────────────────────────────────────*/ |
/*──────────────────────────────────────────────────────────────────────────────────────*/ |
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lastDOW: procedure; arg dow .,mm .,yy .; parse arg a.1,a.2,a.3 |
lastDOW: procedure; arg dow .,mm .,yy .; parse arg a.1,a.2,a.3 /*DOW = day of week*/ |
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if mm=='' | mm=='*' then mm=left( date('U'), 2) |
if mm=='' | mm=='*' then mm= left( date('U'), 2) /*use default month*/ |
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if yy=='' | yy=='*' then yy=left( date('S'), 4) |
if yy=='' | yy=='*' then yy= left( date('S'), 4) /*use default year */ |
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if length(yy)==2 then yy=left( date('S'), 2)yy |
if length(yy)==2 then yy= left( date('S'), 2)yy /*append century. */ |
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/*Note mandatory leading blank in strings below*/ |
/*Note mandatory leading blank in strings below*/ |
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$=" Monday TUesday Wednesday THursday Friday SAturday SUnday" |
$=" Monday TUesday Wednesday THursday Friday SAturday SUnday" |
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!=" JAnuary February MARch APril MAY JUNe JULy AUgust September October November December" |
!=" JAnuary February MARch APril MAY JUNe JULy AUgust September October November December" |
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upper $ ! /*uppercase strings*/ |
upper $ ! /*uppercase strings*/ |
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if dow=='' then call .er "wasn't specified",1 |
if dow=='' then call .er "wasn't specified", 1 /*no month given ? */ |
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if arg()>3 then call .er 'arguments specified',4 |
if arg()>3 then call .er 'arguments specified', 4 /*too many args ? */ |
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do j=1 for 3 /*any plural args ?*/ |
do j=1 for 3 /*any plural args ?*/ |
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if words(arg(j))>1 |
if words( arg(j) ) > 1 then call .er 'is illegal:', j /*check if plural. */ |
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end |
end |
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| ⚫ | |||
dw= pos(' 'dow, $) /*find day-of-week*/ |
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| ⚫ | |||
| ⚫ | |||
if datatype(mm, 'M') then do /*is MM alphabetic?*/ |
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m= pos(' 'mm, !) /*maybe its good...*/ |
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if |
if m==0 then call .er 'is invalid:' , 1 |
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if m\==lastpos(' 'mm,!) then call .er 'is ambiguous:', 2 |
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mm= wordpos( word( substr(!,m), 1), !)-1 /*now, use true Mon*/ |
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end |
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do |
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| ⚫ | |||
| ⚫ | |||
| ⚫ | |||
mm=wordpos( word( substr(!, m), 1), !) - 1 /*now, use true Mon*/ |
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end |
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if \datatype(mm,'W') |
if \datatype(mm, 'W') then call .er "isn't an integer:", 2 /*MM (mon) ¬integer*/ |
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if \datatype(yy,'W') |
if \datatype(yy, 'W') then call .er "isn't an integer:", 3 /*YY (yr) ¬integer*/ |
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if mm<1 | mm>12 |
if mm<1 | mm>12 then call .er "isn't in range 1──►12:", 2 /*MM out─of─range. */ |
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if yy=0 |
if yy=0 then call .er "can't be 0 (zero):", 3 /*YY can't be zero.*/ |
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if yy<0 |
if yy<0 then call .er "can't be negative:", 3 /* " " " neg. */ |
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if yy>9999 |
if yy>9999 then call .er "can't be > 9999:", 3 /* " " " huge.*/ |
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tdow=wordpos(word(substr($,dw),1),$)- |
tdow= wordpos( word( substr($, dw), 1), $) - 1 /*target DOW, 0──►6*/ |
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/*day# of last dom.*/ |
/*day# of last dom.*/ |
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_=date('B',right(yy+(mm=12),4)right(mm//12+1,2,0)"01",'S')-1 |
_= date('B', right(yy + (mm=12), 4)right(mm // 12 + 1, 2, 0)"01", 'S') - 1 |
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?=_ // 7 |
?= _ // 7 /*calc. DOW, 0──►6*/ |
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if ?\==tdow then _=_ - ? - 7 + tdow + 7 * (?>tdow) |
if ?\==tdow then _= _ - ? - 7 + tdow + 7 * (?>tdow) /*not DOW? Adjust.*/ |
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return date('weekday', _, "B") date(, _, 'B') /*return the answer*/ |
return date('weekday', _, "B") date(, _, 'B') /*return the answer*/ |
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/*──────────────────────────────────────────────────────────────────────────────────────*/ |
/*──────────────────────────────────────────────────────────────────────────────────────*/ |
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.er: arg ,_; say; say '***error*** (in LASTDOW)'; |
.er: arg ,_; say; say '***error*** (in LASTDOW)'; say /*tell error, and */ |
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say word('day-of-week month year excess',arg(2)) arg(1) a._ |
say word('day-of-week month year excess', arg(2)) arg(1) a._ /*plug in a choice.*/ |
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say; exit 13 |
say; exit 13 /*··· then exit. */</lang> |
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{{out|output|text= when using the following input of: <tt> 2012 </tt> or <tt> 12 </tt}} |
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<pre> |
<pre> |
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Friday 27 Jan 2012 |
Friday 27 Jan 2012 |
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