isTimezoneSupported(sTimezoneID) {
		if (!this.oSupportedABAPTimezoneIDs) {
			const mCLDR2ABAPTimezones = this.getCLDR2ABAPTimezoneMapping();
			this.oSupportedABAPTimezoneIDs = new Set(this.aSupportedTimezones.map(
				(sCLDRTimezone) => mCLDR2ABAPTimezones[sCLDRTimezone] || sCLDRTimezone));
		}

		return this.oSupportedABAPTimezoneIDs.has(sTimezoneID);
	}
Determines whether the given time zone ID is supported.

@param {string} sTimezoneID The timezone ID to be checked

@returns {boolean} Whether the given ID is supported