Apps Script Trigger Fails to Get Current Date - date

Question

I have created an Apps Script to compile data and save the results to a new Google Sheet.
The code gets the current date with new Date() and uses that for the query and to name the new sheet it creates.
Here is the relevant part of the code:
function exportPayroll(setDate){
var date = new Date();
var newWeek = Utilities.formatDate(_getSunday(date),"GMT", "MM/dd/yyyy");
for (var company in companies){
getPayroll(companies[company],newWeek);
}
}
function _getSunday(d) {
d = new Date(d);
var day = d.getDay(),
diff = d.getDate() - day + (day == 0 ? -7:0); // adjust when day is sunday
return new Date(d.setDate(diff));
}
If I run exportPayroll manually, I get the exact results that I expect. So, I setup this trigger to automate the process:
When the trigger runs, the date value is 12/31/1969 instead of today.
Why does it act different with the trigger? Checking the execution transcript, I don't see any error messages.
Is there a better way to get today's date via a trigger?

Answer 1

Since you just wan't to get the Date of the previous sunday. Try running it this way.
function getLastSunday() {
var d = new Date();
var day = d.getDay();
var diff = d.getDate() - day + (day == 0 ? -7:0); // adjust when day is sunday
return new Date(d.setDate(diff));
}
function exportPayroll(){
var newWeek = Utilities.formatDate(getLastSunday(),"GMT", "MM/dd/yyyy");
for (var company in companies){
getPayroll(companies[company],newWeek);
}
}