Found this on my first search for - Samsung date codes.
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Try searching for - Samsung capacitor date codes..
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If the serial number is 15 digits, the 8th digit is the year and the 9th digit the month.
If the serial number is 11 digits, the 4th digit is the year and the 5th digit the month.
Year Code
2001 R
2002 T
2003 W
2004 X
2005 Y
2006 A or L
2007 P
2008 Q
2009 S
2010 Z
2011 B
2012 C
2013 D
2014 F
2015 G
2016 H
2017 J
Month Code
January 1
February 1
March 3
April 4
May 5
June 6
July 7
August 8
September 9
October A
November B
December C
Martin