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Storing user createdAt date as an integer #1228

ryw opened this Issue Jul 17, 2013 · 4 comments


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ryw commented Jul 17, 2013

In accounts-base/accounts_server.js, Meteor stores the createdAt date using +(new Date). The date is stored in MongoDB as an integer.

I'm trying to generate some basic statistics on user creation, using the following aggregation query:

  { $project:
    { day: { $dayOfYear: new Date('$createdAt') } }
  { $group: 
    { _id: { day: 1 }, total: { $sum: 1 } }

However, it doesn't seem that Mongo supports casting during the aggregation query. I get Jan 1, 1970 for all entries.

If I store the a date using new Date() (an ISODate) then the query works.

db.users.aggregate( { $project: { day: {$dayOfYear: '$createdAt'} } })
  1. Am I missing some way to get an aggregation query to work with the date field as it is?
  2. It's unclear to me whether aggregation framework can be used server side in Meteor presently. Are there any limitations in Meteor (server-side) compared to what should work in Mongo console?

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glasser commented Jul 26, 2013

Good point. This is because we used to not correctly convert JavaScript Dates into the appropriate Mongo type. Now that we support that (with EJSON), this would be a good change. Care to send a pull request fixing this (and ideally auditing the rest of the codebase for similar issues)?


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ryw commented Jul 27, 2013

Pull requested - #1251 - Added my query to fix the data in - not sure if that's the right thing to do, but developers will want to update existing production data to get dates all in same format.


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estark37 commented Aug 21, 2013

Fixed on devel, thanks @ryw!

@estark37 estark37 closed this Aug 21, 2013


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timhaines commented Aug 21, 2013

We'd decided to run with integer dates largely based off Meteor's lead. I guess we have a migration ahead of us.

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