Therefore , if the DST bits differ , DST is changing at 02 : 00 local time during the current UTC day .
The other DST bit , at second 58 , changes 24 hours later ( after the DST change ) .
If the DST bits differ , DST is changing at 02 : 00 local time during the current UTC day .
The other DST bit , at second 58 , changes 24 hours later ( after the DST change ) .