On 07/12/2022 19:56, Ihor Radchenko wrote:
Neil Jerram:
X-WR-TIMEZONE:BST
which I think was intended to mean British Summer Time; but Google
interpreted it as Bangladesh Standard Time. As a result, my events
from Org are shown at the wrong time in Google calendar.
By default, ox-icalendar takes the value of your TZ environment variable.
I think, in most cases TZ is not set, so (format-time-string "%Z") is
used to get abbreviation (that is ambiguous).
On Linux we may try
timedatectl show --property=Timezone --value
during generation of export template. There is a chance that init system
is not systemd, so the command is not available. It is possible to get
timezone from /etc/timezone, but the code would not concise since it may
be a text file or a symlink to the definition. I have no idea concerning
macOS or Windows.
Emacs relies on libc to handle time zones, and there is no API to get
the identifier. I miss the option available in modern browser JavaScript
new Intl.DateTimeFormat().resolvedOptions().timeZone
I have never read .ics file spec, so I am unaware what kinds of name are
allowed for X-WR-TIMEZONE.
