fix: timezone-dropdown (calcom#23469)

* fix: timezone-dropdown

closes: calcom#23453

* coderabbit suggestion

Signed-off-by: Hemant M Mehta <hemant29mehta@gmail.com>

* Update timezone.ts

---------

Signed-off-by: Hemant M Mehta <hemant29mehta@gmail.com>
Co-authored-by: Anik Dhabal Babu <81948346+anikdhabal@users.noreply.github.com>

Author: hemantmm

packages/lib/timezone.ts

@@ -28,7 +28,7 @@ const formatOffset = (offset: string) =>
   offset.replace(/^([-+])(0)(\d):00$/, (_, sign, _zero, hour) => `${sign}${hour}:00`);
 
 export const handleOptionLabel = (option: ITimezoneOption, timezones: Timezones) => {
-  const offsetUnit = option.label.split("-")[0].substring(1);
+  const offsetUnit = option.label.split(/[-+]/)[0].substring(1);
   const cityName = option.label.split(") ")[1];
 
   const timezoneValue = ` ${offsetUnit} ${formatOffset(dayjs.tz(undefined, option.value).format("Z"))}`;