Friday.
Seems like you have a very short memory span...
4th January 2010 will be a Monday
Friday
30 January 2010 is a Saturday.
January 30 2010 is a Saturday.
January 26 2010 is a Tuesday.
January 21 2010 was a Thursday.
January 13th 2010 was a Wednesday.
January 21st 2010 is a Thursday.
January 28th 2010 is a Thursday.
January 1 2010 will be a Friday.
January 18 2010 was a Monday.
January 25 2010 was a Monday.