From my country on Alliance server:

xxxxxx Tanks on sale for $xxx each (Until -171382 seconds from now)
xxxxxx Turrets on sale for $xxx each (Until -168764 seconds from now)
xxxxxx Bushels on sale for $xx each (Until -101161 seconds from now)

then a few minutes later:

xxxxxx Tanks on sale for $xxx each (Until -171597 seconds from now)
xxxxxx Turrets on sale for $xxx each (Until -168979 seconds from now)
xxxxxx Bushels on sale for $xx each (Until -101376 seconds from now)

so yes, looks to be counting to -172,800, in seconds