Last Friday of each month: Difference between revisions

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 =={{header|Nim}}==
-<lang nim>import times, os, strutils
+<lang nim>import os, strutils, times
+const
-var timeinfo = getLocalTime getTime()
+  DaysInMonth: array[Month, int] = [31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31]
-timeinfo.year = paramStr(1).parseInt
+  DayDiffs:  array[WeekDay, int] = [3, 4, 5, 6, 0, 1, 2]
-for month in mJan .. mDec:
-  timeinfo.month = month
+let year = paramStr(1).parseInt
-  for day in countdown(31, 1):
-    timeinfo.monthday = day
+for month in mJan..mDec:
-    let t = getLocalTime(timeInfoToTime timeinfo)
+  var lastDay = DaysInMonth[month]
-    if t.month == month and t.weekday == dFri:
+  if month == mFeb and year.isLeapYear: lastDay = 29
-      echo t.format "yyyy-MM-dd"
+  var date = initDateTime(lastDay, month, year, 0, 0, 0)
-      break</lang>
+  date = date - days(DayDiffs[date.weekday])
-Sample usage:
+  echo date.format("yyyy-MM-dd")</lang>
-<pre>./lastfriday 2012
+{{out}}
+Sample usage: ./lastfriday 2012
+<pre>
 -01-27
 -02-24