== Steps to reproduce
1. Specify the `|date=` parameter in the information template with year- or month-precision ISO 8601 format. //[[https://commons.wikimedia.org/w/index.php?title=File:Qantas_and_contrails.jpg&diff=1110034925|Example]]//
2. Notice that the output HTML correctly uses the appropriate precision: `<time class="dtstart" datetime="2008-02" lang="en" dir="ltr" style="white-space:nowrap">February 2008</time>`
3. Press the //Open in Media Viewer// button, and look at the //Created// date.
== Actual result
4. It reports 1 February 2008, the first day of the month it was taken in (if the specified date had a precision of year, it’d report 1 January of that year).
== Expected result
4. It reports February 2008, without specifying a day.
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==Notes
- In MultimediaViewer, `newFromImageInfo()` preserves the date as is (it doesn't add a day when a day isn't provided). However, `formatDate()` calls JavaScript's native Date constructor, which adds the missing day.
Requirements:
- Dates are preserved as is. When a month-year date is provided, do not reformat the date with a numeric day.
- Add a test, such as a missing day in the date