Table:
text: 1998–99 Nemzeti Bajnokság I
Managerial changes
Managerial changes
Team Outgoing_manager Manner_of_departure Date_of_vacancy Position_in_table Replaced_by Date_of_appointment
BVSC Dragan Seklulić Sacked 10 February 1999 18th József Tajti 10 February 1999
Diósgyőr Gábor Szapor Sacked 14 April 1999 7rd[ clarification needed ] Miklós Temesvári 14 April 1999
Siófok László Nagy Resigned 4 May 1999 16th József Mészáros 4 May 1999
Dunaújváros Zoltán Varga Resigned 12 May 1999 6th Ferenc Ebedli 12 May 1999

Question: When was outgoing manager Zoltán Varga appointed to the 1998/99 National Championship I managerial change?