Default individual publish times use incorrect time conversions

Description

Steps to reproduce

1. Create a new entry using ICatalogSystem.
2. Create a meta object for the new entry, not specifying Epi_StartPublish nor Epi_StopPublish.
3. Load the content corresponding to the entry.

Expected:
StartPublish equals StartDate of the DTO/CatalogEntry table (time zone taken into account). Same for StopPublish/EndDate.

Actual:
The values are not equal, StartPublish/StopPublish are offset according to the UTC offset.

Comment: This happens because when getting the default (fallback) value for Epi_StartPublish/Epi_StopPublish in the meta object, the value read from the database is not correctly converted to a specific DateTimeKind. Hence, it does not happen if those values are specified, like when creating content using content repository.