Question about quoting variables.

["Steven W. Orr" <steveo syslang net>]

In my %post I want to

cp /etc/inittab /etc/inittab-$(date "+%Y%m%d-%k%M%S")

but it doesn't do what I want because the %S seems to expand to SOURCE. 
How do I prevent a variable from being expanded by rpm?

TIA


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