Time Changed Since Midnight Checker

entity_to_check = "binary_sensor.bathroom_door"

//calculates time in ms since midnight
var now = new Date(),
    then = new Date(
        now.getFullYear(),
        now.getMonth(),
        now.getDate(),
        0,0,0),
    time_since_midnight = now.getTime() - then.getTime();

//gets state for entity from Home Assistant
const d = global.get('homeassistant').homeAssistant
var changed = d.states[entity_to_check].last_changed

//calculates time in ms since midnight from time entity last changed
time_since_changed = now.getTime() - new Date(changed).getTime();

//if the value of midnight is greater than the value of time since
//changed, //then the door has been opened and the lock needs to
//be checked
if ((time_since_midnight - time_since_changed) > 1) {
    node.status({fill:"red",shape:"dot",text:"Check lock!"});
    msg.payload = true
} else {
    node.status({fill:"green",shape:"ring",text:"Door okay"});
    msg.payload = false
}
return msg;