I have a collections of data imported from CSV, each doc has at least one datetime in string format. I'm writing a python program to convert the string into ISODate. However, I'm getting error above: 'ISODate' is not defined! I also tried 'new Date' with the same result.

Below is the basic python program:

****
import pymongo
import datetime

connection = pymongo.MongoClient("mongodb://localhost")
db = connection.cts
projects = db.dces.projects

1. All project has start date, update all projects
   projects.update({}, {'$set': {"start": ISODate('start')}})

*****

The average doc look like below:
(these are cut & paste from mongo shell)

> x = db.dces.projects.findOne()
{
"_id" : "OPER",
"status" : "Started",
"name" : "Small Projects",
"stop" : "",
"detail" : "Small project & daily operation request from DC customers",
"start" : "2011-01-01T16:00:00",
"pm" : "stsao"
}
> x.start
2011-01-01T16:00:00
> y= new Date(x.start)
ISODate("2011-01-01T16:00:00Z")
> z = ISODate(x.start)
ISODate("2011-01-01T16:00:00Z")
> db.dces.projects.update({_id:"OPER"},{$set:{start: y}})
WriteResult(

{ "nMatched" : 1, "nUpserted" : 0, "nModified" : 1 }

)
> x = db.dces.projects.findOne()
{
"_id" : "OPER",
"status" : "Started",
"name" : "Small Projects",
"stop" : "",
"detail" : "Small project & daily operation request from DC customers",
"start" : ISODate("2011-01-01T16:00:00Z"),
"pm" : "stsao"
}

I have search the python documentation with not much help. I can brute force it like I do in the shell, but I have well over 7000 datetime in string to change to ISO format, I would love to get the Python program. Or even in JS.

Thanks.