Issue Summary

Using date picker custom field with the format “YYYY/MM/DD”, and setting a date after 2039 using API call, automatically changes the year to 19XX.

Steps to Reproduce

1. Create a date picker custom field
2. Associate the custom field with the project
3. Create a new issue
4. PUT the below API call to set the End Date as "2040-01-01"

PUT http://localhost:8080/rest/api/2/issue/BA-1

{
"fields":{
"customfield_10700":"2040-01-01"
}
}

In the UI, the representation is 01/Jan/40.  We cannot clearly identify if it is 2040 or 1940. 

We also see the 19XX value when we export the issue to XML.

<customfieldvalues>
<customfieldvalue>Mon, 1 Jan 1940 00:23:20 +0553</customfieldvalue>
</customfieldvalues>
</customfield>

But when you send a GET call for that issue, you get the result as customfield_10700": "1940-01-01",

Expected Results

Keep the correct date which was set.

Actual Results

It automatically set the wrong year. customfield_10700": "1940-01-01",

Workaround

None

Currently, there is no known workaround for this behavior. A workaround will be added here when available