Sails.js Waterline query modifiers for dates with sails-mysql?-open source projects balderdashy/sails

I just started using Sails.js with its ORM, Waterline, and absolutely love it, but I am not sure how to use query modifiers for dates. I am using sails-mysql. Specifically, I am trying to get rows that have a datetime field between two specific dates. I have tried doing this:

MyModel.find()
    .where({ datetime_field: { '>=': startDate } })
    .where({ datetime_field: { '