Datetype format issue

I have a date type field and I use default format. When index a field value like : 05/17/2018 01:37:48 PM ZE8, I got an error as below:

Invalid format: "05/17/2018 01:37:48 PM ZE8" is malformed at "/17/2018 01:37:48 PM ZE8"

I tried to use "yyyy-MM-dd HH:mm:ssZ||yyyy-MM-dd||epoch_millis" as the format, but it returned error like
Invalid format: "2018-05-17T05:37:48Z" is malformed at "T05:37:48Z"

Is there any suggestion which format can fix this ? Thx

I think that the default format expects something like day/month/year....

Here 17 can not be a month.

Have a look at this page:

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