Use JIRA's list of versions to get some quick and dirty date-based release counts

jira-versions-count.js

var versions = "Array from https://jira/rest/api/2/project/projectKey/versions";

var dateRegex = /([0-9]{4})([0-9]{2})([0-9]{2})[0-9]{4}/;
var counts = {};
versions.forEach(function(version)
{
	if (dateRegex.test(version.name))
	{
		var dateParts = dateRegex.exec(version.name);
		var yearKey = "" + dateParts[1];
		var monthKey = "" + dateParts[1] + "-" + dateParts[2];
		var dayKey = "" + dateParts[1] + "-" + dateParts[2] + "-" + dateParts[3];
		if (!counts[yearKey])
		{
			counts[yearKey] = 1;
		}
		else
		{
			counts[yearKey]++;
		}
		if (!counts[monthKey])
		{
			counts[monthKey] = 1;
		}
		else
		{
			counts[monthKey]++;
		}
		if (!counts[dayKey])
		{
			counts[dayKey] = 1;
		}
		else
		{
			counts[dayKey]++;
		}
	}
});