Emails set to wromg time zone
I returned to London from Singapore on Tuesday 28/4. Today (4 May) I noticed that all my emails show Singapore time (BST+7) in the Inbox display in Thunderbird on my Windows laptop although the time shown for emails is correct on my mobile (iPhone).
I checked calendar in Thunderbird settings and it's set to "Use system timezone" but the time on my laptop clock is correct. The time zone in my Windows setting is also correct (London).
When I open an email it shows the correct time.
Any thoughts?