EF Core Oracle Timestamp with Timezone to DateTime in c#

Question

With EF Core 2.2.6 I am saving DateTime --> Oracle Timestamp(7) with Time zone : 30.07.19 18:13:23,283000000 +02:00 . But when I am reading it back its : 30.07.19 20:13:23,283000000 +02:00 .

How can I exlpicitly mention in EF core no DateTime convertions?

Answer 1

Dealing with DateTimes and Timezones is between complicated and able to drive you mad . However I have 3 rules that make working with them manageable:

1. Always store and retrieve the UTC value
2. Avoid storing or transmission as string
3. If you can not follow rule 2 (like with XML), at least pick a fixed enconding and culture to use on every endpoint. You really do not want to add those to your worries.

However there are some scenarios (like a Calendar) where you have to deal with timezones instead.

Also note that 0.07.19 18:13:23,283000000 +02:00 is not actually the value. This is a String Representation of the value, using the users settings for details like formating and timezone.

Answer 2

Solved the issue. Changed the driver from Devart to Oracle.EntityFrameworkCore 2.19.30

1) Devart driver got some issues with Timezone offset. reading with timstamp + offset and writing to DB with out offset.

2) Oracle.EntityFrameworkCore 2.19.30 released a week back is the perfect solution for me. It solved 1) Timezone issue and 2) performance issue (10X faster). 3) some other small issues in my web application.

Thank you.