RZSero writes:

<"For that matter, *can* there be gezerot in the BHMK? After 
all, "ein shevut bamikdash"; or are we distinguishing "shevut" which 
refers only to Shabbat, from general gezerot?>

     The first mishna in Shas tells us that hekteir chalavim 
v'eivarim, though their time for hakrava min haTorah is all night, 
were to be offered by chatzos.

      But in fact, even as far as Shabbos prohibitions are concerned, 
there are exceptions to the rule of ein sh'vus bamikdash.  See 
Tosafos in Shabbos 123b, s.v. "Lo," in explanation of the mishna in 
M'nachos 96a that arranging and removing the kanim for the lechem 
hapanim on the shulchan were prohibited on Shabbos.

EMT