title: ICalendar .ICS file DTStart seems not be interpreted the same by Google and Outlook
body: <p>I create a .ics file with:</p>
  <pre><code>DTSTART;TZID=Europe/London:20220812T100000
  DTEND;TZID=Europe/London:20220812T103000
  </code></pre>
  <p>The goal is a meeting at 10AM London time (BST).</p>
  <p>Send it to my work account (Outlook), personal UK account (Gmail 1) and personal IT account (Gmail 2).</p>
  <p>When I open the attached .ics file in the emails I have a different Start (also End) meeting time depending from the account.</p>
  <p>Outlook and Gmail 1 accounts are UK locale, both the emails are opened in the same PC (UK locale).<br />
  Gmail 2 account is IT and is opened on an Android tabled (IT locale).</p>
  <p><strong>Outlook</strong>:<br />
  <a href="https://i.stack.imgur.com/dn2GV.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/dn2GV.png" alt="enter image description here" /></a></p>
  <p>and the Meeting is created in the calendar with the WRONG start time: 11.00.</p>
  <p><strong>Gmail 1 (UK user)</strong>:<br />
  <a href="https://i.stack.imgur.com/IUdUQ.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/IUdUQ.png" alt="enter image description here" /></a></p>
  <p>and the meeting is created in the calendar with the CORRECT start time: 10:00.<br />
  (DTEnd has the same issue obviously)</p>
  <p><strong>Gmail 2 (IT user)</strong>:<br />
  No image but the meeting is set to be at 11:00 Italian time.<br />
  That is the CORRECT start time: 11AM in Italy -&gt; 10AM in London.<br />
  (Italy is GMT+2 while UK is GMT+1 at this date).</p>
  <p>I assume Outlook is not interpreting the time correctly.</p>
  <ol>
  <li>Why Outlook get the wrong time?</li>
  <li>How to solve this (the requirement is to use TimeZoneID, so I cannot use UTC date)?</li>
  </ol>
  <h2>[EDIT]</h2>
  <p>This is the full .ics file:</p>
  <pre><code>BEGIN:VCALENDAR 
  METHOD:REQUEST 
  PRODID:-//github.com/rianjs/ical.net//NONSGML ical.net 4.0//EN 
  VERSION:2.0 
  BEGIN:VEVENT 
  DESCRIPTION:Alex meeting at 10 AM London 
  DTSTAMP:20220811T080000Z 
  DTSTART;TZID=Europe/London:20220812T100000 
  DTEND;TZID=Europe/London:20220812T103000  
  LOCATION:London 
  SEQUENCE:0 
  STATUS:CONFIRMED 
  SUMMARY:Alex meeting at 10 AM London 
  TRANSP:OPAQUE 
  UID:ccc1a025-c45b-3a05-9305-d5538e6660e4 
  END:VEVENT 
  END:VCALENDAR
  </code></pre>