COREOR, start/end validity date

It's very common to define, in COREOR message, a start/end validity date.

Here below you can find related sample:

(...)
EQD+CN+GEKU1234567:102:5+22G1:102:5++3+5'
RFF+SQ:1'
RFF+BM:123456'
DTM+7:20101012:102'
DTM+36:20101020:102'
(...)