Agenda should allow better control over time zone

[jasonjoh]

Proposal: Support time zones

Description

Allow me to:

• Specify a specific time zone on the component (maybe a timezone property?)
• Disable any adjustment of the date/times and render exactly what's given

Rationale

Currently, the agenda component assumes two things:

• The date/time values on events are in UTC
• I want to render them in the browser's time zone

These assumptions lead to trouble. I can request event times to be returned by Graph in a specific time zone using the Prefer: outlook.timezone="Pacific Standard Time" header, so it could be possible that as a developer I don't want you to do any adjusting of the times.

Alternatively, I might want you to adjust it (say if I'm letting the component do the query), but want it in the user's time zone, not the browsers. This is similar to how OWA does it.

Preferred Solution

Additional Context

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[waldekmastykarz]

This would absolutely be very useful. In fact, I'm just working on refactoring an SPFx web part that uses this setting to retrieve events. Ideally, the mgt-agenda component would support specifying the timezone as a string but also automatically retrieving it for the current user from /me/mailboxSettings.

[waldekmastykarz]

As discussed with @nmetulev, let's split this issue in two for easier tracking:

1. Setting the preferred timezone based on the value specified by the user
2. Automatically retrieving timezone and including it in the Graph request

Let's keep this issue focused on 1 and I'll create a new issue for 2.