Converted actual UTC time is outputing incorrectly 1 month ahead of actual time

[ezyu2]

In the mysql db, the last_mod_datetime value is correct. No timezone config issues. Can somebody tell me what is wrong with my conversion function "getLastDateMod" above where the output is adding 1 month to the actual date?

function getLastDateMod(_date){
var ret = "";
if (_date){
ret = _date.formatToDate("yyyy-MM-ddTHH:mm:ss[\+,\-][0-9][0-9]?:[0-9][0-9]?").format("MM/dd/yyyy HH:mm");
}else{
ret = "";
}
return ret ;
}

Additional code:
name: getLocaleAttribute(RS_METADATATEMPLATES, "TXT_last_modified", "METADATATEMPLATES"),
canResize: true,
canSort: true,
sortField: "last_mod_datetime",
field: "lastModifyTime",
formatter : getLastDateMod,
width: '20%'

[Philip M]

Months in Javascript are 0 (January) -11 (December).

Quizmaster: Since 1920 a statue of which former US President has resided in Parliament Square?
Contestant: Ronald Reagan