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Sorry, I overlooked the other class: RunPeriodControl:DaylightSavingTime.

!-   ===========  ALL OBJECTS IN CLASS: RUNPERIODCONTROL:DAYLIGHTSAVINGTIME ===========

! Daylight Saving Period in US

RunPeriodControl:DaylightSavingTime,
2nd Sunday in March,     !- Start Date
1st Sunday in November;  !- End Date

And I/O Reference says that this input always overrides any daylight saving period specifed in a weather file.

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Then I guess that we should consider DST for energy models If the site location is in a country that uses DST.