i have collection `vacation` that looks like something like this :

```
[
  {
  _id: ..
  employeeId: ...
  type: ...
  startDate:2022-09-10T00:00:00.000+00:00
  endDate: 2022-09-15T00:00:00.000+00:00
  }
  {
  _id: ..
  employeeId: ...
  type: ...
  startDate:2022-01-10T00:00:00.000+00:00
  endDate: 2022-02-15T00:00:00.000+00:00
  }
  {
  _id: ..
  employeeId: ...
  type: ...
  startDate:2022-03-10T00:00:00.000+00:00
  endDate: 2022-04-15T00:00:00.000+00:00
  }
]
...

```

i want to get docs only when the month in `startDate` is equal to specific month

```

const Vacation = require("../models/Vacation");

const vacations = await Vacation.find({// where month in startDate is equal to 2})

```

how can i perform such query ? thanks in advance