mojoPortal content management system generally stores date/time values in the database as UTC and provides timezone adjustment when displaying date/time data according to the user's time zone as specified on the My Account page.
For unauthenticated users, time is displayed using the default time zone from Site Settings, whereas for authenticated users (users who are signed in) it is based on the time zone from the user profile.
When new users register on the site they can choose their time zone or leave it at the default setting which comes from the Site Settings time zone.
Time will adjust correctly even during daylight savings time.
Note that our time zone system does not work correctly under Linux/Mono, so in that environment it uses time offsets that don't adapt to daylight savings time.