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Add note about negative epoch times #61379

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Aug 20, 2020
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Add note about negative epoch times #61379

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3 changes: 3 additions & 0 deletions docs/reference/mapping/types/date.asciidoc
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Expand Up @@ -10,6 +10,9 @@ JSON doesn't have a date data type, so dates in Elasticsearch can either be:
* a long number representing _milliseconds-since-the-epoch_.
* an integer representing _seconds-since-the-epoch_.

NOTE: Values for _milliseconds-since-the-epoch_ and _seconds-since-the-epoch_
must be non-negative. Use a formatted date to represent dates before 1970.

Internally, dates are converted to UTC (if the time-zone is specified) and
stored as a long number representing milliseconds-since-the-epoch.

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