My C# program must communicate with a REST API which wants me to supply dates in a format that looks something like this:

Code:
Some examples that work:

   20151001T170952%2B1000

   20130305T170030+0400


Their documentation doesn't describe the format in detail. It essentially makes a circular statement: "for your date query to work on our REST API, make sure the date is in the format that our REST API uses". Or something like that. There's no link to exactly what this format means.

It looks vaguely like ISO 8601, but when I tell C# to use ISO 8601 with the "o" format, I get something that looks different:

Code:
ISO 8601:

 2015-10-20T13:40:59.4105922-07:00


I'm temporarily going to work around it by just specifying it directly with MM DD YY etc in the right place. But I'll be worried that's wrong, and that I'm missing something.

Does anyone recognize exact precise date format? Do you know what it's called, ie, can you give it an exact canonical name that I can google for? Is there a precise format specifier for it?

Thanks!
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Tony Fabris