Flaky test: if at second boundary can fail and cause CI build to fail
https://travis-ci.org/boostorg/date_time/jobs/330925380#L1373
testing.capture-output ../../bin.v2/libs/date_time/test/testmicrosec_time_clock.test/gcc-7/debug/cxxstd-03-iso/testmicrosec_time_clock.run
====== BEGIN OUTPUT ====== 2018-Jan-20 01:55:59 2018-Jan-20 01:55:59.911262000 Pass :: hours match Pass :: minutes match Pass :: seconds match Pass :: hours date ...failed testing.capture-output ../../bin.v2/libs/date_time/test/testmicrosec_time_clock.test/gcc-7/debug/cxxstd-03-iso/testmicrosec_time_clock.run...
Pass :: last is less 2018-Jan-20 01:55:59 2018-Jan-20 01:56:00.003424000 Pass :: hours match FAIL :: minutes match FAIL :: seconds match Pass :: hours date Pass :: last is less 2018-Jan-20 01:56:00 2018-Jan-20 01:56:00.109788000 Pass :: hours match Pass :: minutes match Pass :: seconds match Pass :: hours date Pass :: last is less