Timezone problem with make check?

[Aaron Laws]

I am running ninja check on master and two tests fail, both having to do
with time. One is test-gnc-date.c, and I drilled down. The line that fails
is 721:

g_assert_cmpint (na.tv_sec, ==, ra.tv_sec);

na is 739299600, and ra is 739296000. na - ra = 3600 which is one hour.

I'm hoping someone already knows what's going on. I'll look at the other
test, too.