10.0 PostgreSql InvalidCastException with DateTime

I encountered the following error when trying to launch a brand new project with v10.0 and PostgreSql :

InvalidCastException : Cannot write DateTime with Kind=Local to PostgreSQL type ‘timestamp with time zone’, only UTC is supported.

To resolve it I needed to add the following line of code in the ConfigureServices method : System.AppContext.SetSwitch("Npgsql.EnableLegacyTimestampBehavior", true);

I don’t know if it’s a good way to resolve this but at least it work’s for now.

Resources I’ve found about it : https://github.com/npgsql/efcore.pg/issues/2000 https://www.npgsql.org/efcore/release-notes/6.0.html

Hope it helps.

[gyfke]

This is unfortunate as the solution was taken from the Npsql homepage:

I had the same problem on empty database. Before legacy timestamp behavior applied : base(options) is called And the base class constructor seeds the default data and throws the exception

[tidyui]

We’ll take a look if we can add default configuration in our extension methods to avoid this problem!