Product: HOMER Grid 

This article describes how to ensure Daylight Savings Time (DST) corresponds appropriately to your time series and tariff file. 

The tariff builder asks for the time-zone, for which the tariff should apply so that the tariff can make the Daylight Savings Time (DST) jump appropriately.



The timeseries is a list of numbers, starting with Jan 1, where the date-time is not recognized and tied to the load measurement. To repeat that sentence another way: any file you upload as a timeseries will be treated as a list of load data information, starting Jan 1, and it will define the timestep length by dividing the number of rows by 8760. (8760 rows/8760 = hourly timesteps, for example.) 

This means that when you view time series data from HOMER Grid (or export it) the timestamp will not skip an hour at the start of daylight savings or duplicate a timestamp at the end. The data itself will be correct, as well as the calculations, but the timestamp is output so that it is easiest for a computer to display the results to you.

So, to ensure that the daylight savings date defined by the tariff's timezone will correspond to the date which daylight savings happens in the time series, make sure that the year which your specifies the upload of your time-series data, as shown above, is the same year as the year specified on the Electric Load page as 'year to model' (below). 



By the way, this "Year to model" can be set on the Electric Load page or within the Project > Settings page; setting in either place will have the same effect.