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Computing related timestamps by subtracting "N days" is sensitive to the prevailing timezone, since we interpret that as "same local time on the N'th prior day". Even though the intervals in question are only two to four days, through remarkable bad luck they managed to cross the end of Ramadan in 2014, causing the test's output to change if timezone is set to Africa/Casablanca. (Maybe in other Muslim areas as well; I didn't check.) There's absolutely no reason for this test to exercise interval subtraction, so just get rid of that and use plain timestamptz constants representing the intended values. Per report from Andres Freund. Back-patch to v10 where this test script came in. Discussion: https://postgr.es/m/20210930183641.7lh4jhvpipvromca@alap3.anarazel.de