I'm running a test in a loop using test_that from my workstation in Boulder (MST timezone) against a device in the lab, chromeos1-row2-rack7-host3.cros. The timestamps, both those output from the test_that command and from autotest's debug logs, jump forward an hour (to CST? where'd that come from?) during each test run:

INFO:root:Identity added: /tmp/test_that_results_cnmIxy/testing_rsa (/tmp/test_that_results_cnmIxy/testing_rsa)
10:25:31 INFO | Running autotest_quickmerge step.
10:25:31 INFO | quickmerge| 10:25:31: INFO: RunCommand: sudo -- /usr/bin/python2 /mnt/host/source/chromite/bin/autotest_quickmerge '--board=lumpy'
10:25:32 INFO | quickmerge| 10:25:32: INFO: RunCommand: rsync -a --no-p '--chmod=ugo=rwX' -u -i '--exclude=**.pyc' '--exclude=**.pyo' '--exclude=** ->
 *' '--include-from=/mnt/host/source/chromite/scripts/autotest-quickmerge-includepatterns' '--exclude=*' /mnt/host/source/src/third_party/autotest/fil
es/ /build/lumpy/usr/local/build/autotest/
10:25:32 INFO | quickmerge| 10:25:32: INFO: Updating portage database.
10:25:33 INFO | quickmerge| 10:25:33: INFO: RunCommand: rsync -a --no-p '--chmod=ugo=rwX' -u -i '--exclude=**.pyc' '--exclude=**.pyo' '--exclude=** ->
 *' '--include-from=/mnt/host/source/chromite/scripts/autotest-quickmerge-includepatterns' '--exclude=*' // /build/lumpy/usr/local/build/autotest/
10:25:33 INFO | quickmerge| 10:25:33: INFO: Updating portage database.
10:25:34 INFO | quickmerge| 10:25:34: INFO: RunCommand: touch /build/lumpy/usr/local/build/autotest/.quickmerge_sentinel
10:25:34 INFO | quickmerge| 10:25:34: INFO: Quickmerge complete. Created or modified 1 files.
10:25:34 INFO | Re-running test_that script in /build/lumpy/usr/local/build/autotest copy of autotest.
INFO:root:Identity added: /tmp/test_that_results_EOCubE/testing_rsa (/tmp/test_that_results_EOCubE/testing_rsa)
10:25:34 INFO | Began logging to /tmp/test_that_results_EOCubE
Adding labels [u'cros-version:ad_hoc_build', u'board:lumpy'] to host chromeos1-row2-rack7-host3.cros
11:25:35 INFO | Fetching suite for job named desktopui_ChromeSanity...
11:25:38 INFO | Scheduling suite for job named desktopui_ChromeSanity...
11:25:38 INFO | ... scheduled 1 job(s).
...