How can compare Date on mongo without time? - mongodb

Question

This is a sample data
[{ date: '2020-05-21T14:02:00.0123 }, { date: '2020-05-22T14:02:00.0123 }, { date: '2020-05-23T14:02:00.0123 }]
I want to filter records of 22-May or earlier, here is my expected:
[{ date: '2020-05-21T14:02:00.0123 }, { date: '2020-05-22T14:02:00.0123 }]
I tried with this query:
{ date: { $lte: new Date('2020-05-22') }}
But it returns only data earlier 22-May. I think problem is { date: { $lte: new Date('2020-05-22') }} will data.date lte 2020-05-22T00:00:00.000
How I can exclude time ?

Answer 1

You need to match type of input with type of date field in document, either both should be Date's or strings. I would highly suggest maintain dates as dates in DB. Also you need to know that dates in MongoDB are of format ISODate() and holds UTC date.
If your DB date field is of type date :
I want to filter records of 22-May or earlier
As you wanted to get documents <= 22-May, then sending new Date('2020-05-22') doesn't work. Cause :
when you do new Date('2020-05-22'), it will give you Fri May 22 2020 00:00:00 GMT only if you belong to UTC, for example if you're in New York America which is 4 hours behind UTC then it would result in Thu May 21 2020 20:00:00 GMT-0400 (Eastern Daylight Time) which represents EDT, basically it's your system/app server time i.e; local date time.
So if your region is behind UTC then you'll get a back date Thu May 21 2020 otherwise if it's ahead of UTC then there is no issue you'll see Fri May 22 2020.
Ok, now that we've fixed date issues, but we need to look into hours now :
Since you want docs <= 22-May then Fri May 22 2020 00:00:00 GMT doesn't work you need to have either <= Fri May 22 2020 23:59:59 GMT or Sat May 23 2020 00:00:00 GMT. In order to get that :
let date = new Date('2020-05-22')
date.setDate(date.getUTCDate()); // Setting utc date, Only useful if you're region is behind UTC
date = new Date(date.setHours(23,59,59,999)) // This overrides hours generated with 23:59:59 - which is what exactly needed here.
/** Now do your query */
{ date: { $lte: date }}
If your DB date field is of type string :
Then you don't need to convert string to date, instead you can send input date in string format :
let date = new Date('2020-05-22').toISOString() // 2020-05-22T00:00:00.000Z
/** Above would get you an ISO string no matter which region you're in, 
* now since we need `2020-05-22T23:59:59.000Z` which is not easy on ISO string
* We would just do +1 on date like `new Date('2020-05-23').toISOString()` - // 2020-05-23T00:00:00.000Z */
let date = new Date('2020-05-23').toISOString(); // like this
date = date.slice(0, -1) // removing `Z` from date string as your `date` field doesn't have this.
// Now your query is just `$lt`
{ date: { $lt: date }}
Test : mongoplayground