// Format as per flot requirements
var flotData = new[]
{
    new {label = "Quantity Required", data = partAvailability.Select(x => new[] {x.TimeStamp, x.QuantityRequired})},
    new {label = "Quantity Available", data = partAvailability.Select(x => new[] {x.TimeStamp, x.QuantityAvailable})}
};

// Timestamp created as follows
private static long GetJavascriptTimestamp(DateTime date)
{
  return (long)date.Subtract(new DateTime(1970, 1, 1, 0, 0, 0, DateTimeKind.Utc)).TotalMilliseconds;
}