t0di

var from= new Date(2013, 5, 12);
var to= new Date(2016, 2, 25);
getRange(from, to);
function getRange(dateFrom, dateTo) {
    var dayRange = (dateTo - dateFrom)/(1000 * 60 * 60 * 24);

    var result = {};
    for(var i = 0; i < dayRange; i++) {
        if (typeof result[dateFrom.getFullYear()] == "undefined")
            result[dateFrom.getFullYear()] = {};
        if (typeof result[dateFrom.getFullYear()][dateFrom.getMonth()+1] == "undefined")
            result[dateFrom.getFullYear()][dateFrom.getMonth()+1] = [];

        result[dateFrom.getFullYear()][dateFrom.getMonth()+1].push(dateFrom.getDate());

        dateFrom.setDate(dateFrom.getDate() + 1);
    }
    return result;
}

@if (th.FMessage.Count > 0)
            {
              var message = th.FMessage.OrderByDescending(m => m.ForumMessageId).FirstOrDefault();
              @message.MessageDate
                <text>От</text> @message.User.DisplayName
            }