A smart socket has an off setting, an on setting, and a manual switch to switch manually between the off setting and the on setting. An automatic switch mode provides for switching automatically between the off setting and the on setting, based on time and/or on sensor input. The socket also has a Sabbath mode, wherein the manual switch is disabled and the automatic switching is based on time or on a predetermined set of sensors, wherein the smart socket is configured to enter the Sabbath mode based on Sabbaths and/or festivals using the Hebrew calendar and locally calculated daylight times.