use of 'date' in rpm .spec %define concats add'l str chars?

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on F32,



date +FORMAT,



	date +%Y%m%d_%H%M%S

returns



	20200703_105351



as expected.





in an rpm .spec, if I define



	%define _build_timestamp %( date +%Y%m%d_%H%M%S )





and _use_ %{_build_timestamp) _anywhere_ else in the spec, at exec of any of rpmbuild/mock build/@COPR etc, it appears as



	'20200703_105351OURCE'

	                ?????





Simply changing the define to



	%define _build_timestamp %( date +%Y%m%d_%H%M%S | head -c 15 )



'fixes' the problem, and use of %{_build_timestamp) correctly returns



	'20200703_105351'



Is this a bug in rpmbuild or date? Or a problem in my usage?


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