The Year 2000 compatibility of the personal computer hardware and software will need to be checked. Action 2000 in its Homecheck documentation has published information on checking PC systems. If help is required contact the retailer or PC manufacturer. Internet connections also need a modem. Most modems do not require date functions and should continue to work.
Some burglar alarms have automatic calling capability to notify alarm activation.
Although the alarm may have a date and time display it is unlikely that it cease working if there is a problem. If in doubt check with the alarm supplier or maintainer. For business Telecommunications are vital to business. If your business has not looked at its Year 2000 readiness it should do so now. Some businesses make use of equipment to transmit and receive data.