Date Histogram calendar vs fixed intervals

Hello, I am looking at the Date Histogram documentation and trying to understand the details of Calendar vs Fixed intervals. For periods of days or greater I get it, and the results I see from periods that span DST time zones correctly reflect those changes. But for intervals in minutes or hours I see no difference between fixed and calendar intervals. I have queried times that cross DST and cross leap second boundaries and they look the same. Can anyone give examples that show a distinction between these two? Thanks.

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