Table:
text: 2010–11 Primeira Liga
Managerial changes
Managerial changes
Team Outgoing_head_coach Manner_of_departure Date_of_vacancy Position_in_table Incoming_head_coach Date_of_appointment
Sporting Paulo Sérgio Resigned 26 February 2011 3rd José Couceiro 26 February 2011
Beira-Mar Leonardo Jardim Resigned 28 February 2011 10th Rui Bento 1 March 2011
Vitória de Setúbal Manuel Fernandes Sacked 1 March 2011 14th Bruno Ribeiro 1 March 2011

text: 2010–11 Primeira Liga
Managerial changes
Managerial changes
Team Outgoing_head_coach Manner_of_departure Date_of_vacancy Position_in_table Incoming_head_coach Date_of_appointment
União de Leiria Lito Vidigal Sacked 7 July 2010 Off-season Pedro Caixinha 10 July 2010
Marítimo Mitchell van der Gaag Sacked 14 September 2010 15th Pedro Martins 14 September 2010
Naval 1º de Maio Victor Zvunka Sacked 27 September 2010 14th Rogério Gonçalves 6 October 2010
Académica Jorge Costa Resigned 21 December 2010 9th José Guilherme 27 December 2010
Naval 1º de Maio Rogério Gonçalves Sacked 19 December 2010 16th Carlos Mozer 30 December 2010
Portimonense Litos Sacked 28 December 2011 16th Carlos Azenha 29 December 2010
Académica José Guilherme Resigned 20 February 2011 13th Ulisses Morais 22 February 2011

Question: If the position in the table is 10th and the exit mode was abandoned, what was the date of the vacancy in 2010-11 Primeira Liga?