The 30Q indeed has a date code!. But it is printed on the metal can, not the wrapper.
Read here, please.
Can, Line 1 (4 digit number):
3rd digit: Year (1-9,A-G)
4th digit: Month (1-9,A-C), for (SDIEM): Month(O…Z)
example: 10F3
F = 2015
3 = mar.
I think this works for most Samsung cells. Also for those that also have date code on the wrapper (4 digits in third line, digit 2 and 3).