David B., Jim B., Patrick T. We looked at H1:ALS-Y_REFL_SERVO_IN1EN from '00:00:00 Nov 2 PDT' to '03:00:00 Nov 2 PST'. The correct behavior is observed: ... 11/02/2014 01:59:59.005479920 PDT Off NO_ALARM NO_ALARM 11/02/2014 01:59:59.055615806 PDT On NO_ALARM NO_ALARM 11/02/2014 01:00:01.060458106 PST Off NO_ALARM NO_ALARM 11/02/2014 01:00:01.110599290 PST On NO_ALARM NO_ALARM ... Note that PDT and PST should be specified for searches covering times of the changeover.