How can I format DateTime to web UTC format?

Question

I have a DateTime which I want to format to \"2009-09-01T00:00:00.000Z\", but the following code gives me \"2009-09-01T00:00:00.000+01:00\" (both l

Answer 1

You want to use DateTimeOffset class.

var date = new DateTimeOffset(2009, 9, 1, 0, 0, 0, 0, new TimeSpan(0L));
var stringDate = date.ToString("u");

sorry I missed your original formatting with the miliseconds

var stringDate = date.ToString("yyyy'-'MM'-'dd'T'HH':'mm':'ss'.'fff'Z'");