How to convert UTC timezone to CET timezone in graph api? - microsoft-graph-api

Question

Am tried with this piece of code
var Option = new List<Option>()
{
new QueryOption("startDateTime", filterStartDate.ToLongDateString()),
new QueryOption("endDateTime", filterEndDate.ToLongDateString()),
new HeaderOption("Prefer","outlook.timezone=\"Central European Time\"")
};
but am getting the bad request error.
Can anyone help me with this?

Answer 1

I have 2 ideas on your scenario, the first is that, according to the official sample, you can add Prefer request header like this if you used Graph SDK.
var events = await graphClient.Me.Events
.Request()
.Header("Prefer","outlook.timezone=\"Pacific Standard Time\"")
.Select("subject,body,bodyPreview,organizer,attendees,start,end,location")
.GetAsync();
By the way, the time zone you used is Central European Time but it's not supported by graph api. Per my searching, only Central European Standard Time can be found.
In general, the timeZone property can be set to any of the time zones currently supported by Windows, as well as the additional time zones supported by the calendar API.

Answer 2

The correct time zone is Central Europe Standard Time not Central European Time.
If you are calling calendar view events, startDateTime and endDateTime must be represented in ISO 8601 format.
var queryOptions = new List<QueryOption>()
{
new QueryOption("startDateTime", filterStartDate.ToUniversalTime().ToString("o")),
new QueryOption("endDateTime", filterEndDate.ToUniversalTime().ToString("o"))
new HeaderOption("Prefer","outlook.timezone=\"Central Europe Standard Time\"")
};
var calendarView = await graphClient.Me.Calendar.CalendarView
.Request(queryOptions)
.GetAsync();