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Add versions of timestamptz + interval, timestamptz - interval, and generate_series(timestamptz, ...) in which a timezone can be specified explicitly instead of defaulting to the TimeZone GUC setting. The new functions for the first two are named date_add and date_subtract. This might seem too generic, but we could use overloading to add additional variants if that seems useful. Along the way, improve the docs' pretty inadequate explanation of how timestamptz +- interval works. Przemysław Sztoch and Gurjeet Singh; cosmetic changes and most of the docs work by me Discussion: https://postgr.es/m/01a84551-48dd-1359-bf7e-f6b0203a6bd0@sztoch.pl