From b84acc8c76128f7827ac7f5877bb992994770f9f Mon Sep 17 00:00:00 2001
From: Sacha Chua <sacha@sachachua.com>
Date: Sun, 19 Nov 2023 16:04:30 -0500
Subject: New function emacsconf-timezone-strings-combined

That should make it easier to specify multiple
timezones (comma-separated) and use those in e-mails
---
 emacsconf-mail.el | 24 +++++++-----------------
 emacsconf.el      | 22 ++++++++++++++++++++++
 2 files changed, 29 insertions(+), 17 deletions(-)

diff --git a/emacsconf-mail.el b/emacsconf-mail.el
index 1656bef..8c0fedb 100644
--- a/emacsconf-mail.el
+++ b/emacsconf-mail.el
@@ -677,16 +677,10 @@ ${signature}"
 	(let ((result
 				 (concat
 					(plist-get o :title) "\n"
-					(format-time-string "%b %-e %a %-I:%M %#p %Z" (plist-get o :start-time) emacsconf-timezone) "\n"
-					(if (and (plist-get o :timezone) (not (string= (plist-get o :timezone) emacsconf-timezone)))
-							(if (string= (format-time-string "%z" (plist-get o :start-time) (plist-get o :timezone))
-													 (format-time-string "%z" (plist-get o :start-time) emacsconf-timezone))
-									(format "which is the same time in your local timezone %s\n"
-													(emacsconf-schedule-rename-etc-timezone (plist-get o :timezone)))
-								(format "translated to your local timezone %s: %s\n"
-												(emacsconf-schedule-rename-etc-timezone (plist-get o :timezone))
-												(format-time-string "%b %-e %a %-I:%M %#p %Z" (plist-get o :start-time) (plist-get o :timezone))))
-						""))))
+					(emacsconf-timezone-strings-combined
+					 (plist-get o :start-time)
+					 (plist-get o :timezone)
+					 "%b %-e %a %-I:%M %#p %Z"))))
 		(when (called-interactively-p 'any)
 			(insert result))
 		result))
@@ -1242,18 +1236,14 @@ as soon as you can and I'll try to shuffle things around. Thank you!")
 			:checkin-info
 			(mapconcat
        (lambda (o)
-         (let ((base-checkin (format-time-string "%b %-d %-l:%M %p" (plist-get o :checkin-time) emacsconf-timezone))
-               (speaker-checkin (format-time-string "%b %-d %-l:%M %p" (plist-get o :checkin-time) (plist-get o :timezone))))
            (emacsconf-replace-plist-in-string
 						(append (list :base-url emacsconf-base-url
 													:check-in
 													(concat
                            "Before "
-                           base-checkin " in " emacsconf-timezone
-                           (if (string= base-checkin speaker-checkin)
-                               ""
-                             (concat
-															", which is the same as " speaker-checkin " in " (plist-get o :timezone))) "\n"
+													 (emacsconf-timezone-strings-combined
+														(plist-get o :checkin-time)
+														(plist-get o :timezone))
                            "  (this is " (plist-get o :checkin-label) ")")
 													:qa-info-speakers
 													(cond
diff --git a/emacsconf.el b/emacsconf.el
index 9746308..d5e6c3d 100644
--- a/emacsconf.el
+++ b/emacsconf.el
@@ -1098,9 +1098,31 @@ The subheading should match `emacsconf-abstract-heading-regexp'."
               (format-time-string "%-l:%M %p %Z"
                                   end tz)
               tz))))
+
 (defun emacsconf-timezone-strings (o &optional timezones)
   (mapcar (lambda (tz) (emacsconf-timezone-string o tz)) (or timezones emacsconf-timezones)))
 
+(defun emacsconf-timezone-strings-combined (time timezones &optional format)
+	"Show TIME in TIMEZONES.
+If TIMEZONES is a string, split it by commas."
+	(let* ((format (or format "%b %-d %-l:%M %p"))
+				 (base-time (format-time-string format time emacsconf-timezone))
+				 (timezones (if (stringp timezones) (split-string timezones " *, *" t))))
+		(concat base-time " in " (emacsconf-schedule-rename-etc-timezone emacsconf-timezone)
+						(if timezones
+								(concat
+								 " (which is "
+								 (mapconcat
+									(lambda (tz)
+										(let ((translated-time (format-time-string format time tz)))
+											(if (string= translated-time base-time)
+													(concat "the same in " (emacsconf-schedule-rename-etc-timezone tz))
+												(concat translated-time " in " (emacsconf-schedule-rename-etc-timezone tz)))))
+									timezones
+									"; ")
+								 ")")
+							""))))
+
 ;;;###autoload
 (defun emacsconf-convert-from-timezone (timezone time)
   (interactive (list (progn
-- 
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