The 15th of February can take place on any of the 7 days of the week. It depends on the year. Taking this century to date, you have the 15th of February as follows:
Thursday 15 February 2001
Friday 15 February 2002
Saturday 15 February 2003
Sunday 15 February 2004
Tuesday 15 February 2005
Wednesday 15 February 2006
Thursday 15 February 2007
Friday 15 February 2008
Sunday 15 February 2009
Monday 15 February 2010
Tuesday 15 February 2011
Wednesday 15 February 2012
Friday 15 February 2013
Saturday 15 February 2014