When raw is not turned on in uploader, datestring is incorrect in mongo

[ELUTE]

Raw turned on:
{
"_id": {
"$oid": "5522c5651cf1df2d0fd7f239"
},
"sysTime": 197588596,
"unfiltered": 96592,
"filtered": 108256,
"direction": "FortyFiveDown",
"device": "DEXCOM_G4",
"rssi": 189,
"sgv": 64,
"dateString": "2015-04-06T13:40:00.751-04:00",
"type": "sgv",
"date": 1428342000751,
"noise": 1
}

Raw turned off:
{
"_id": {
"$oid": "5522c6911cf1df2d0fd7f288"
},
"sysTime": 197559858,
"device": "DEXCOM_G4",
"sgv": 59,
"dateString": "1970-01-02T17:49:04.902-05:00",
"type": "sgv",
"date": 168544902,
"direction": "FortyFiveDown"
}