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In DOE-2 and EnergyPlus, a day is from hour 1 to hour 24 and hour 1 presents the time interval 00:00:01AM to 1:00:00AM

Source: Comparison of Building Energy Modeling Programs: Building Loads

In DOE-2 and EnergyPlus, a day is from hour 1 to hour 24 and hour 1 presents the time interval 00:00:01AM to 1:00:00AM1:00:00AM.

Source: Comparison of Building Energy Modeling Programs: Building Loads

Side note: It makes it a bit tricky to import it directly into programming languages such as Python (Pandas) in the case of E+ When you have varying reporting periods (in DOE-2 you know it's 8760 hours...)