Im trying to use a forumla to calc sunset. However when I save it, it has an error on line 9.

```
var diff = (now - start) + ((start.getTimezoneOffset() - now.getTimezoneOffset()) * 60 * 1000);
```

Its complaing that now and start are the wrong type. But when i run the code in js it works fine.... How do i change this to work with node red?

See the function code:

```
function sunriseset(la, lo, sunrise) {
const now = new Date();
const xmonth = now.getMonth() + 1;
const xyear = now.getFullYear();
var start = new Date(now.getFullYear(), 0, 0);
var diff = (now - start) + ((start.getTimezoneOffset() - now.getTimezoneOffset()) * 60 * 1000);
var oneDay = 1000 * 60 * 60 * 24;
var day = Math.floor(diff / oneDay);
const zenith = 90.83333333333333;
const D2R = Math.PI / 180;
const R2D = 180 / Math.PI;
// convert the longitude to hour value and calculate an approximate time
const lnHour = lo / 15;
let t;
if (sunrise) {
t = day + ((6 - lnHour) / 24);
} else {
t = day + ((18 - lnHour) / 24);
}
//calculate the Sun's mean anomaly
const M = (0.9856 * t) - 3.289;
//calculate the Sun's true longitude
let L = M + (1.916 * Math.sin(M * D2R)) + (0.020 * Math.sin(2 * M * D2R)) + 282.634;
if (L > 360) {
L = L - 360;
}
else if (L < 0) {
L = L + 360;
}
//calculate the Sun's right ascension
let RA = R2D * Math.atan(0.91764 * Math.tan(L * D2R));
if (RA > 360) {
RA = RA - 360;
}
else if (RA < 0) {
RA = RA + 360;
}
//right ascension value needs to be in the same qua
const Lquadrant = (Math.floor(L / (90))) * 90;
const RAquadrant = (Math.floor(RA / 90)) * 90;
RA = RA + (Lquadrant - RAquadrant);
//right ascension value needs to be converted into hours
RA = RA / 15;
//calculate the Sun's declination
const sinDec = 0.39782 * Math.sin(L * D2R);
const cosDec = Math.cos(Math.asin(sinDec));
//calculate the Sun's local hour angle
const cosH = (Math.cos(zenith * D2R) - (sinDec * Math.sin(la * D2R))) / (cosDec * Math.cos(la * D2R));
let H;
if (sunrise) {
H = 360 - R2D * Math.acos(cosH);
} else {
H = R2D * Math.acos(cosH)
}
H = H / 15;
//calculate local mean time of rising/setting
const T = H + RA - (0.06571 * t) - 6.622;
//adjust back to UTC
let UT = T - lnHour;
if (UT > 24) {
UT = UT - 24;
}
else if (UT < 0) {
UT = UT + 24;
}
const ms = UT * 60 * 60 * 1000;
const time = new Date(ms);
time.setFullYear(now.getFullYear());
time.setMonth(now.getMonth());
time.setDate(now.getDate());
return time;
}
// sunset
var lat = -34.92866000
var lon = 138.59863000
var sunset = sunriseset(lat, lon, false)
msg.payload = sunset
return msg;
```