java.lang.IllegalArgumentException: Unknown pattern character 'u'

I want to get number of day (1=Sunday, etc..)
According to this:
http://ift.tt/1jJ4UwO

Code:

  Sub FindDayOfWeek

Dim Today As Int

DateTime.DateFormat = "u"
    Today = DateTime.Date(DateTime.Now)
Log (Today)

End Sub  

Getting error on "u" line

Code:

  Error occurred on line: 61 (OpenJobsCleaning)
java.lang.IllegalArgumentException: Unknown pattern character 'u'
    at...  

java.lang.IllegalArgumentException: Unknown pattern character 'u'

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