In my Cosmos database, I have a property CreatedAt which is a DateTime . I want the value to be generated automatically upon insert. In my OnModelCreating method I've tried the following without any success: modelBuilder.Entity<User>().Property(p => p.CreatedAt).ValueGeneratedOnAdd(); modelBuilder.Entity<User>().Property(p => p.CreatedAt).HasDefaultValueSql("getdate()"); modelBuilder.Entity<User>().Property(p => p.CreatedAt).HasDefaultValue(DateTime.Now); Looking in Cosmos DB Emulator, this property is always set to the default DateTime value. What am I doing wrong here?

Generate default value in EF Core Cosmos

In my Cosmos database, I have a property CreatedAt which is a DateTime. I want the value to be generated automatically upon insert.

In my OnModelCreating method I've tried the following without any success:

modelBuilder.Entity<User>().Property(p => p.CreatedAt).ValueGeneratedOnAdd();
modelBuilder.Entity<User>().Property(p => p.CreatedAt).HasDefaultValueSql("getdate()");
modelBuilder.Entity<User>().Property(p => p.CreatedAt).HasDefaultValue(DateTime.Now);

Looking in Cosmos DB Emulator, this property is always set to the default DateTime value. What am I doing wrong here?