Description of problem:
I was reproducing bug 2135772.

Version-Release number of selected component:
gnome-calendar-43.0-6.fc37

Additional info:
reporter:       libreport-2.17.4
backtrace_rating: 4
cgroup:         0::/user.slice/user-1000.slice/user/app.slice/dbus-:1.2-org.gnome.Calendar
cmdline:        /usr/bin/gnome-calendar --gapplication-service
crash_function: g_time_zone_ref
executable:     /usr/bin/gnome-calendar
journald_cursor: s=f4cd173e5269413aa99ddc1baa016978;i=191761;b=95c5bc90029d4c279649ff4c47fd92c0;m=d70ff1a2;t=5ebdc668c00e1;x=60b1b54a10642a2a
kernel:         5.19.16-301.fc37.x86_64
rootdir:        /
runlevel:       N 5
type:           CCpp
uid:            1000

Truncated backtrace:
Thread no. 1 (10 frames)
 #0 g_time_zone_ref at ../glib/gtimezone.c:286
 #1 g_date_time_alloc at ../glib/gdatetime.c:679
 #2 g_date_time_from_instant at ../glib/gdatetime.c:774
 #3 g_date_time_new_from_unix at ../glib/gdatetime.c:936
 #4 format_month_year at ../src/gui/event-editor/gcal-date-chooser.c:295
 #5 get_value_string at ../src/gui/event-editor/gcal-multi-choice.c:77
 #6 apply_value at ../src/gui/event-editor/gcal-multi-choice.c:103
 #7 set_value at ../src/gui/event-editor/gcal-multi-choice.c:130
 #8 gcal_multi_choice_set_value at ../src/gui/event-editor/gcal-multi-choice.c:551
 #9 gcal_date_chooser_set_date at ../src/gui/event-editor/gcal-date-chooser.c:475

Potential duplicate: bug 1476566