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Is it possible to select from a collection of images for example of 30 years and ask only the image of July for each year? The below only include July images for a single year.
var aoi = ee.Geometry.Point([0, 10])
Map.addLayer(aoi)
var collection = ee.ImageCollection('COPERNICUS/S2')
.filterBounds(aoi)
.filterDate('2020-07-01', '2020-08-01')
As Daniel suggests, use ee.Filter.calendarRange() for 30 years sequence and for July filtering. You can stack .filter() functions:
var aoi = ee.Geometry.Point([0, 10])
Map.addLayer(aoi)
var collection = ee.ImageCollection('COPERNICUS/S2')
.filterBounds(aoi)
.filter(ee.Filter.calendarRange(1990,2020,'year'))
.filter(ee.Filter.calendarRange(7,7,'month'));
A 30 years sequence isn't possible to obtain from S2 since it was launched in 2015
ee.Filter.calendarRange(183, 213, 'day_of_year'). Because of leap years, you don't get exact calendar month, but hopefully close enough for your use-case. code.earthengine.google.com/9e2fe3a1785ce3a676a245154c58375a