You can configure the supported date formats for JSON uploads in the file eidProvisioningConfig/dateFormats.txt.
The content of this file is a list of the date formats that are checked when processing JSON input. If an input date does not match any of the formats defined in this file, it will not be processed as a date.
Date formats must conform to Java SimpleDateFormat: http://docs.oracle.com/javase/6/docs/api/java/text/SimpleDateFormat.html.
Processing of date format patterns is not lenient. For details, see http://docs.oracle.com/javase/6/docs/api/java/text/DateFormat.html#setLenient%28boolean%29.
Dates that do not include a time zone are processed as Greenwich Mean Time (GMT).
If a date matches multiple patterns, an arbitrary pattern is selected when uploading the data to Endeca Server.