How can I store and retrieve position in DLTM projection in PostGIS geography.

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    Welcome to GIS.SE! Can you please edit your question and explain in detail what you want to do, what you've tried so far and where exactly you ran into problems? – karpfen Sep 25 '17 at 12:24
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    geography is a datatype for geographic (angular) coordinate systems only. – Vince Sep 25 '17 at 12:28

You cannot. Instead, use the geometry type, which let you set the coordinate system of your choice

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