# Date Histogram calendar vs fixed intervals

**URL:** <https://discuss.elastic.co/t/date-histogram-calendar-vs-fixed-intervals/266010>\
**Category:** Elasticsearch\
**Created:** [March 2, 2021, 8:05pm UTC](https://discuss.elastic.co/t/date-histogram-calendar-vs-fixed-intervals/266010 "2021-03-02T20:05:36Z")\
**Posts on this page:** 2\
**Page:** 1

<div class="post-metadata">

**Author:** ![spaffrath](https://avatars.discourse-cdn.com/v4/letter/s/c68b51/32.png) [@spaffrath](https://discuss.elastic.co/u/spaffrath)\
**Post date:** [March 2, 2021, 8:05pm UTC](https://discuss.elastic.co/t/date-histogram-calendar-vs-fixed-intervals/266010/1 "2021-03-02T20:05:36Z")

</div>

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.

---

<div class="post-metadata">

**Author:** ![system](https://us1.discourse-cdn.com/elastic/original/3X/1/a/1ac57faf039f6b580b3f104ef42a2a89e41014de.png) [@system](https://discuss.elastic.co/u/system)\
**Post date:** [March 30, 2021, 8:05pm UTC](https://discuss.elastic.co/t/date-histogram-calendar-vs-fixed-intervals/266010/2 "2021-03-30T20:05:50Z")

</div>

This topic was automatically closed 28 days after the last reply. New replies are no longer allowed.