import std/[times, os, strutils, strbasics, strscans, sets, re, tables], parseopt

proc getWeekNumber(date: DateTime): int =
  return int((date.monthDay - 1) / 7) + 1

proc getWeekNumberFromEnd(date: DateTime): int =
  let daysInMonth = getDaysInMonth(date.month, date.year)
  let day = date.monthday
  return int((daysInMonth - day) / 7) + 1

var d = now() - 21.days
echo getWeekNumber(d)