Recently, the network implemented a date range specification as part of the "Ninja Search Options". From the linked post, here's an extract on the implementation:
This is now implemented, here are some examples:
created:2012(created between 2012-01-01 and 2012-12-31)created:2012-04(created between 2012-04-01 and 2012-04-30)created:2012-04-05(created on 2012-04-05, 24 hr UTC range)The above date formats can be applied to a range as well with
.., like this:
created:2012..2012(created between 2012-01-01 and 2012-12-31)created:2012-03..2012-04(created between 2012-03-01 and 2012-04-30)created:2012-01-05..2012-01-10(you get the idea)Those are for when a question is created. For the last time it was active (same as the active tab) you can use
lastactive:the same way ascreated:above.
So, you could find the specific question you remember seeing last and visit it using the link:
https://tex.stackexchange.com/q/<number>
Then, identify the date of that question and perform a search based on that creation date. This will list posts in newest-to-oldest form (technically not what you're after). Here's how to search for questions tagged amsmath between Jan 2, 2013 and Mar 1, 2013:
is:question [amsmath] created:2013-01-02..2013-03-01
