On Fedora 26/Emacs 25.3.1 and Debian Jessie/Emacs 24.4.1, test-org/timestamp-from-time fails with:
| Test test-org/timestamp-from-time backtrace: | (if (unwind-protect (setq value-14556 (apply fn-14554 args-14555)) ( | (let (form-description-14558) (if (unwind-protect (setq value-14556 | (let ((value-14556 (quote ert-form-evaluation-aborted-14557))) (let | (let ((fn-14554 (function equal)) (args-14555 (list "<2012-03-29 Thu | (lambda nil (let ((fn-14554 (function equal)) (args-14555 (list "<20 | ert--run-test-internal([cl-struct-ert--test-execution-info [cl-struc | ert-run-test([cl-struct-ert-test test-org/timestamp-from-time "Test | ert-run-or-rerun-test([cl-struct-ert--stats "\\(org\\|ob\\)" [[cl-st | ert-run-tests("\\(org\\|ob\\)" #[385 "\306\307\"\203G\211\211G\310 | ert-run-tests-batch("\\(org\\|ob\\)") | ert-run-tests-batch-and-exit("\\(org\\|ob\\)") | (let ((org-id-track-globally t) (org-test-selector (if org-test-sele | org-test-run-batch-tests("\\(org\\|ob\\)") | eval((org-test-run-batch-tests org-test-select-re)) | command-line-1(("--eval" "(setq vc-handled-backends nil org-startup- | command-line() | normal-top-level() | Test test-org/timestamp-from-time condition: | (ert-test-failed | ((should | (equal "<2012-03-29 Thu>" | (let ... ...))) | :form | (equal "<2012-03-29 Thu>" "<2012-03-28 Wed>") | :value nil :explanation | (array-elt 10 | (different-atoms | (57 "#x39" "?9") | (56 "#x38" "?8"))))) | FAILED 754/762 test-org/timestamp-from-time Both machines run on UTC. Tim