I recall now...it is position of the string wrt the (x, y) location. So, to justify left, you need to draw to the right of points with constant x value. So, that is correct.
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I think Proc Expand can do what you want, do you have SAS/ETS licensed?
https://communities.sas.com/t5/SAS-Procedures/PROC-EXPAND-daily-to-weekly-aggregation-with-missing-values/td-p/212201
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