Question: SV Werder Bremen won its first ever German double, clinching both Bundesliga and the DFB-Pokal, Werder lost both Aílton and defensive senior talisman Mladen Krstajić to Schalke 04, Krstajić is a former Serbian footballer who played as a centre back, born on which date?
Context: The 2017–18 SV Werder Bremen season is the 119th season in the football club's history and 37th consecutive and 54th overall season in the top flight of German football, the Bundesliga, having been promoted from the 2.  Bundesliga Nord in 1981.  In addition to the domestic league, Werder Bremen also are participating in this season's edition of the domestic cup, the DFB-Pokal.  This is the 71st season for Bremen in the Weser-Stadion, located in Bremen, Free Hanseatic City of Bremen, Germany.  The season covers a period from 1 July 2017 to 30 June 2018. Frank Neubarth (born 29 July 1962 in Hamburg) is a German football manager and former player who spent his whole career with SV Werder Bremen and has since managed FC Schalke 04, Holstein Kiel and FC Carl Zeiss Jena. The 1964–65 SV Werder Bremen season is the 55th season in the football club's history and 2nd consecutive and overall season in the top flight of German football, the Bundesliga, having earned qualification for the inaugural season from the Oberliga in 1963, after finishing second in the Oberliga Nord.  Werder Bremen also participated in the season's edition of the domestic cup, the DFB-Pokal.  The season covers a period from 1 July 1964 to 30 June 1965. Karl-Heinz 'Kalli' Kamp (born 26 September 1946) is a German retired football player and coach.  He spent 13 seasons in the Bundesliga with SV Werder Bremen.  As of July 2012, he works as a scout for SV Werder Bremen. Mladen Krstajić (Serbian Cyrillic: Младен Крстајић; born 4 March 1974) is a former Serbian footballer who played as a centre back.  He was known for his composure, leadership and defensive ability.  He represented Serbia and Montenegro at the 2006 FIFA World Cup. SV Werder Bremen won its first ever German double, clinching both Bundesliga and the DFB-Pokal.  Following a club record-breaking league season, Werder won the title six points clear of Bayern Munich, with Aílton hitting 28 goals, the most ever from a Werder Bremen player.  The cup victory was clinched following a 3–2 win against Alemannia Aachen, with defensive midfielder Tim Borowski the unexpected hero, hitting Alemannia with a brace.  The title successes were Thomas Schaaf's first in his managerial career.  However, Werder lost both Aílton and defensive senior talisman Mladen Krstajić to Schalke 04, since both refused to sign new contracts with the club. Uwe Harttgen (born 6 July 1964) is a retired German football player currently working as a youth team coordinator for SV Werder Bremen.  He spent six seasons in the Bundesliga with SV Werder Bremen.  After his career as an active player, he earned a PhD in psychology and became youth team coordinator for his club SV Werder Bremen. SV Werder Bremen II is the reserve team of SV Werder Bremen.  It currently plays in 3.  Liga, the third level of the German football league system, and has qualified for the first round of the DFB-Pokal on nineteen occasions.  It also has won the German amateur football championship three times, a joint record.  Until 2005 the team played as SV Werder Bremen Amateure. The 1991–92 SV Werder Bremen season was their 93rd year of existence.  They participated in the Bundesliga, DFB-Pokal and the European Cup Winners' Cup.  The finished 9th in the Bundesliga.  They lost in a shoot-out to Hannover 96 in the semi-finals of the DFB-Pokal and won European Cup Winners' Cup. SV Werder Bremen Frauen is SV Werder Bremen's women's football section, currently competing in the Bundesliga.  In 2014–15 they were promoted to the Bundesliga.
Answer: 4 March 1974