====== WeekOfYear ======

The function //WeekOfYear (<Date>,[Weekday rule],[First day of week])// returns the weekday on the given date.

  * Date: The date from which the day of the week is to be calculated.
  * weekday rule (Default value: **first four days**.):
    * 0 = First day
    * 1 = the whole week
    * 2 = first four days
  * First day of the week (Default value: Monday):
    * 0 = Sunday
    * 1 = Monday
    * 2 = Tuesday
    * ...

==== Syntax: ====

<code>WeekOfYear(ConvertDateTimeFromString('01.07.2015', 'dd.MM.yyyy'))</code>
liefert **27**
<code>WeekOfYear(ConvertDateTimeFromString('01.07.2015', 'dd.MM.yyyy'), 1)</code>
liefert **26**