function _createServiceItem(mServiceInfo) {
		var iExpirationDate = _getCurrentTime() + _iValidityPeriod;
		var mSystemInfo = _getSystemInfo();
		var parsedServiceInfo = _extractServiceInfo(mServiceInfo);

		return {
			serviceKey: mSystemInfo.getName() + mSystemInfo.getClient() + parsedServiceInfo.serviceName + parsedServiceInfo.serviceVersion,
			expirationDate: iExpirationDate
		};
	}
Create a serviceItem from a given serviceInfo map.

The serviceInfo map belongs to the public interface of this 'class'.
ServiceItems are used to store outdated services in the local storage.
A service item consists of a unique key per service and an expiration date.

@private
@param  {string|map} [mServiceInfo] serviceInfo Object or serviceUri
@return {map} serviceItem