I want to point out that this functionality does exist already in iNat’s filter system through search URLs. On the Explore page (and also the Identify page), the filter menu lets you select between 1 and 12 months narrow down your observations:
This option is then reflected in the search URL with the “months=” parameter.
Certain explore/identify search URL parameters can be used on other parts of the site, but unfortunately the photo viewer is quite limited in what search parameters it accepts. If you add “months=5” to your photo viewer URL, nothing happens.
I point this out for two reasons:
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Because you can already do this on some parts of the website (and also because you can sort the photo viewer by date), I suspect it wouldn’t be too hard for iNat staff to add this function, if they agree it’s a good idea.
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While you can’t filter the photo viewer by months, using the month filters on the Explore page is probably your best workaround.