Fix timestamp

[OttiaDevsPT]

No description provided.

[kotivuori]

With these changes timestamp is "0001-01-01T00:00:00.000Z". More useful implementation would be for example DateTime.UtcNow.ToString("yyyy-MM-ddTHH:mm:ss.fffZ") which results in current UTC timestamp.

[obetsak]

From the side where we are consuming the information it would be mutch better if you would use DateTimeOffset rater then DateTime. Since we consume the time information on different plattforms with different timezones and where the offset depending on timezone is different depending on the time of the year. We can offcource assume that it is UTC and convert from DateTime to DateTimeOffset before converting to local time but it would be better if we didn't have to.

[kotivuori]

This doesn't add the requested offset.
DateTimeOffset.Now.ToString("yyyy-MM-dd'T'HH:mm:ss.fffzzz") gets the desired result.