Hi,
In Jira you can create versions and give them "Start Date" and "Release date":

I need to access those dates from the REST API. I found a call that looks perfect, except the "Start Date" field is missing for the results:
/rest/agile/1.0/board/11/version?maxResults=50&startAt=0&released=false
{
"maxResults": 50,
"startAt": 0,
"isLast": true,
"values": [
{
"self": "https://<myinstance>.atlassian.net/rest/api/2/version/10006",
"id": 10006,
"projectId": 10005,
"name": "V1",
"description": "V1",
"archived": false,
"released": false,
"releaseDate": "2019-04-28T00:00:00.000Z"
},
{
"self": "https://<myinstance>.atlassian.net/rest/api/2/version/10007",
"id": 10007,
"projectId": 10005,
"name": "V2",
"description": "V2",
"archived": false,
"released": false,
"releaseDate": "2019-05-30T00:00:00.000Z"
}
]
} Is there any way to get that missing field? Another API call? A hidden parameter? Some black magic maybe? 
Thanks!