title: Mongoexport: Issues using -q to specify date
body: <p>I'm having a problem using mongoexport with a query using dates. The question and answer here is almost exactly like my situation, but I can't figure out why it didn't work for me:
  <a href="https://stackoverflow.com/questions/5191186/how-do-i-dump-data-for-a-given-date">How do I dump data for a given date</a></p>
  
  <p>Based on the answer there, I structured my query like this: </p>
  
  <p>./mongoexport -d database  -c collection -f _id,zooniverse_user_id -q '{"created_at":{"$lt":new Date(1296540000)}}' --csv >users_before_feb_eleven.csv</p>
  
  <p>I used this date/epoch time converter to convert ISODate("2011-02-01T00:00:00z") to 1296540000: </p>
  
  <p><a href="http://www.esqsoft.com/javascript_examples/date-to-epoch.htm" rel="nofollow noreferrer">http://www.esqsoft.com/javascript_examples/date-to-epoch.htm</a></p>
  
  <p>I don't get any errors, but it exports "0 records" (I should be getting around 10,000.) </p>
  
  <p>Thank you!</p>