function checkTimezone(sTimezone) {
		const bIsValidTimezone = TimezoneUtils.isValidTimezone(sTimezone);
		if (!bIsValidTimezone) {
			Log.error("The provided timezone '" + sTimezone + "' is not a valid IANA timezone ID." +
				" Falling back to browser's local timezone '" + TimezoneUtils.getLocalTimezone() + "'.");
		}
		return bIsValidTimezone;
	}
Checks if the provided timezone is valid and logs an error if not.

@param {string} sTimezone The IANA timezone ID
@returns {boolean} Returns true if the timezone is valid
@private
@since 1.120.0