http – Search repos with GitHub API using date query

If I make the following GET request to the GitHub API, I get about 58 entries:

https://api.github.com/search/repositories?&per_page=250&sort=updated&order=asc&q=%22github-octocat%22

However, the following with any date parameters return 0 entries:

Created since date: ( created:>=2010-09-01 )

https://api.github.com/search/repositories?&per_page=250&sort=updated&order=asc&q=%22github-octocat+created:>=2010-09-01%22

Date range: ( created:2012-08-13..2020-08-14 )

https://api.github.com/search/repositories?&per_page=250&sort=updated&order=asc&q=%22github-octocat+created:2012-08-13..2020-08-14%22

In the GitHub docs, under the section Constructing a search query, the syntax is outlined as such:

SEARCH_KEYWORD_1 SEARCH_KEYWORD_N QUALIFIER_1 QUALIFIER_N

Thei GitHub docs at Search by when a repository was created or last updated outlines date formats like the two above, and Query for values between a range outlines valid combinations of them. I suspect these examples are not meant for this use, as the examples use URLs intended for browsers, such as https://github.com/search?q=case+pushed%3A%3E%3D2013-03-06+fork%3Aonly&type=Repositories, instead of api.github.com, which is confusing too.

I’m trying to apply the patterns shown in the following resources in order to get a range of dates filter:

Any pointers greatly appreciated.