Google Apps Script indexOf date not working? - google-apps-script

Question

function Get_month_column_summary()
{
var month = sheetToPlan.getRange(2, 3).getValue();
Logger.log(month);
var lastCol = summarySheet.getLastColumn();
var lookupRangeValues = summarySheet.getRange(2,1,1,lastCol).getValues();
var concat = [].concat.apply([],lookupRangeValues);
Logger.log(concat);
var index = concat.indexOf(month) + 1;
Logger.log(index);
return index;
}
So basically, I'm trying to find the index of a specific date that I got from sheet 1 and trying to find that same date in sheet 2. But when the index gives me -1 (i added 1 so it shows 0 instead of -1 in logs) for some reason, even though i see that it is in the array, the date that im searching for. It is in the exact same format and wording, 100% the same. but the indexOf still gives me -1. Any idea what is going on here?
[20-05-27 18:21:43:667 HKT] **Fri May 01 00:00:00 GMT+08:00 2020**
[20-05-27 18:21:44:002 HKT] [Sun Jan 01 00:00:00 GMT+08:00 2017,
Wed Feb 01 00:00:00 GMT+08:00 2017,
Wed Mar 01 00:00:00 GMT+08:00 2017,
Sat Apr 01 00:00:00 GMT+08:00 2017,
Mon May 01 00:00:00 GMT+08:00 2017,
Thu Jun 01 00:00:00 GMT+08:00 2017,
Sat Jul 01 00:00:00 GMT+08:00 2017,
Tue Aug 01 00:00:00 GMT+08:00 2017,
Fri Sep 01 00:00:00 GMT+08:00 2017,
Sun Oct 01 00:00:00 GMT+08:00 2017,
Wed Nov 01 00:00:00 GMT+08:00 2017,
Fri Dec 01 00:00:00 GMT+08:00 2017,
Mon Jan 01 00:00:00 GMT+08:00 2018,
Thu Feb 01 00:00:00 GMT+08:00 2018,
Thu Mar 01 00:00:00 GMT+08:00 2018,
Sun Apr 01 00:00:00 GMT+08:00 2018,
Tue May 01 00:00:00 GMT+08:00 2018,
Fri Jun 01 00:00:00 GMT+08:00 2018,
Sun Jul 01 00:00:00 GMT+08:00 2018,
Wed Aug 01 00:00:00 GMT+08:00 2018,
Sat Sep 01 00:00:00 GMT+08:00 2018,
Mon Oct 01 00:00:00 GMT+08:00 2018,
Thu Nov 01 00:00:00 GMT+08:00 2018,
Sat Dec 01 00:00:00 GMT+08:00 2018,
Tue Jan 01 00:00:00 GMT+08:00 2019,
Fri Feb 01 00:00:00 GMT+08:00 2019,
Fri Mar 01 00:00:00 GMT+08:00 2019,
Mon Apr 01 00:00:00 GMT+08:00 2019,
Wed May 01 00:00:00 GMT+08:00 2019,
Sat Jun 01 00:00:00 GMT+08:00 2019,
Mon Jul 01 00:00:00 GMT+08:00 2019,
Thu Aug 01 00:00:00 GMT+08:00 2019,
Sun Sep 01 00:00:00 GMT+08:00 2019,
Tue Oct 01 00:00:00 GMT+08:00 2019,
Fri Nov 01 00:00:00 GMT+08:00 2019,
Sun Dec 01 00:00:00 GMT+08:00 2019,
Wed Jan 01 00:00:00 GMT+08:00 2020,
Sat Feb 01 00:00:00 GMT+08:00 2020,
Sun Mar 01 00:00:00 GMT+08:00 2020,
Wed Apr 01 00:00:00 GMT+08:00 2020,
**Fri May 01 00:00:00 GMT+08:00 2020**,
Mon Jun 01 00:00:00 GMT+08:00 2020,
Wed Jul 01 00:00:00 GMT+08:00 2020,
Sat Aug 01 00:00:00 GMT+08:00 2020,
Tue Sep 01 00:00:00 GMT+08:00 2020,
Thu Oct 01 00:00:00 GMT+08:00 2020,
Sun Nov 01 00:00:00 GMT+08:00 2020,
Tue Dec 01 00:00:00 GMT+08:00 2020,
Fri Jan 01 00:00:00 GMT+08:00 2021,
Mon Feb 01 00:00:00 GMT+08:00 2021,
Mon Mar 01 00:00:00 GMT+08:00 2021,
Thu Apr 01 00:00:00 GMT+08:00 2021,
Sat May 01 00:00:00 GMT+08:00 2021,
Tue Jun 01 00:00:00 GMT+08:00 2021,
Thu Jul 01 00:00:00 GMT+08:00 2021,
Sun Aug 01 00:00:00 GMT+08:00 2021,
Wed Sep 01 00:00:00 GMT+08:00 2021,
Fri Oct 01 00:00:00 GMT+08:00 2021,
Mon Nov 01 00:00:00 GMT+08:00 2021,
Wed Dec 01 00:00:00 GMT+08:00 2021,
Sat Jan 01 00:00:00 GMT+08:00 2022,
Tue Feb 01 00:00:00 GMT+08:00 2022]
[20-05-27 18:21:44:010 HKT] 0.0

Answer 1

This solution may work :
var index = concat.indexOf(month.toString()) + 1;
I you cant to convert all concat data with
var concatstr = []
concat.forEach(e => concatstr.push(e.toString()))