Calendar:Timezones

Timezones

An event can be defined in any timezone, or be 'floating' (meaning there is no timezone defined)

The calendar is displayed in a timezone the users configured (usually the timezone he lives in, but could be anything)

Issues

• In what timezone should the datepicker be when editing an event? In the stored timezone or in the display timezone?
• Should editing show the timezone?
• calIDateTime.jsDate is always in the local timezone. Should it be banned?
• In what timezone are events created by default?
• UTC events have issues with recurrance and daylist saving time. For example, 14:00 in UTC can be 12:00 or 13:00 in european time. Recurring every week at 14:00 UTC will change the time in european time. So UTC isn't a suitable storage for normal events.
• How to find out the timezone the user lives in? (in tzid format if possible)

Suggestions

for editing:

• floating events show the floating time
• other timezones show in the display timezone
• not complete yet

for getting the default timezone + the ui:

• instead of the olsen list of timezones, just store the zones using their name, not their city (CET, PST etc)
• the name can be retrieved from the OS
• have a list of cities per timezone to present to the user
• It should be possible to get this data from the olsen data with some smart scripting