# Date formats do they really use camelCase or under\_bars? **URL:** \ **Category:** Elasticsearch\ **Created:** [July 22, 2013, 7:29pm UTC](https://discuss.elastic.co/t/date-formats-do-they-really-use-camelcase-or-under-bars/12885 "2013-07-22T19:29:09Z")\ **Posts on this page:** 3\ **Page:** 1
**Author:** ![Douglas\_Moore](https://avatars.discourse-cdn.com/v4/letter/d/46a35a/32.png) [@Douglas\_Moore](https://discuss.elastic.co/u/Douglas_Moore)\ **Post date:** [July 22, 2013, 7:29pm UTC](https://discuss.elastic.co/t/date-formats-do-they-really-use-camelcase-or-under-bars/12885/1 "2013-07-22T19:29:09Z")
The documentation[http://www.elasticsearch.org/guide/reference/mapping/date-format/](http://www.elasticsearch.org/guide/reference/mapping/date-format/)on date-formats suggest to get yyyyMMdd format mapping to use "format": "basic\_date". However, when querying the \_mapping for a type with a "type":"date", I get "format":"dateOptionalTime" instead of "date\_optional\_time" as per the documentation. So what is it, camelCase or under\_bars when specifying date formats? Could someone update the documentation please? Thanks much, Douglas -- You received this message because you are subscribed to the Google Groups "elasticsearch" group. To unsubscribe from this group and stop receiving emails from it, send an email to [elasticsearch+unsubscribe@googlegroups.com](mailto:elasticsearch+unsubscribe@googlegroups.com). For more options, visit [https://groups.google.com/groups/opt\_out](https://groups.google.com/groups/opt_out). ---
**Author:** ![spinscale](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/spinscale/32/25011_2.png) [@spinscale](https://discuss.elastic.co/u/spinscale)\ **Post date:** [July 23, 2013, 6:22am UTC](https://discuss.elastic.co/t/date-formats-do-they-really-use-camelcase-or-under-bars/12885/2 "2013-07-23T06:22:00Z")
Hey both work, you can specifiy the date either using camel case or the snake\_case. If you do not specify anything the camelCase version is returned. --Alex On Mon, Jul 22, 2013 at 9:29 PM, Douglas Moore [dmoore247@gmail.com](mailto:dmoore247@gmail.com) wrote: > The documentation[http://www.elasticsearch.org/guide/reference/mapping/date-format/](http://www.elasticsearch.org/guide/reference/mapping/date-format/)on date-formats suggest to get yyyyMMdd format mapping to use "format": > "basic\_date". > However, when querying the \_mapping for a type with a "type":"date", I get > "format":"dateOptionalTime" instead of "date\_optional\_time" as per the > documentation. > > So what is it, camelCase or under\_bars when specifying date formats? > Could someone update the documentation please? > > Thanks much, > Douglas > > -- > You received this message because you are subscribed to the Google Groups > "elasticsearch" group. > To unsubscribe from this group and stop receiving emails from it, send an > email to [elasticsearch+unsubscribe@googlegroups.com](mailto:elasticsearch+unsubscribe@googlegroups.com). > For more options, visit [https://groups.google.com/groups/opt\_out](https://groups.google.com/groups/opt_out). -- You received this message because you are subscribed to the Google Groups "elasticsearch" group. To unsubscribe from this group and stop receiving emails from it, send an email to [elasticsearch+unsubscribe@googlegroups.com](mailto:elasticsearch+unsubscribe@googlegroups.com). For more options, visit [https://groups.google.com/groups/opt\_out](https://groups.google.com/groups/opt_out). ---
**Author:** ![system](https://us1.discourse-cdn.com/elastic/original/3X/1/a/1ac57faf039f6b580b3f104ef42a2a89e41014de.png) [@system](https://discuss.elastic.co/u/system)\ **Post date:** [July 6, 2017, 2:25am UTC](https://discuss.elastic.co/t/date-formats-do-they-really-use-camelcase-or-under-bars/12885/3 "2017-07-06T02:25:07Z")