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Description of Problem:
The roundtrip pattern should be culture-neutral; it shouldn't use the culture's format strings *or* calendar system. On Mono, it does - so any cultures with a different calendar system (giving a different date) will given an incorrect result.
Steps to reproduce the problem:
Run this code:
var culture = new CultureInfo("ps-AF");
var date = new DateTime(1976, 6, 19);
Actual Results: 1396-06-22T00:00:00.0000000
Expected Results: 1976-06-19T00:00:00.0000000
How often does this happen? Always
Mono version 3.0.6
Ditto for the "s" (sortable) standard format by the way.
Fixed in master