Bug 22450 - DateTimeOffset does not round trip
Summary: DateTimeOffset does not round trip
Alias: None
Product: Class Libraries
Classification: Mono
Component: mscorlib ()
Version: 3.6.0
Hardware: PC Linux
: --- normal
Target Milestone: Untriaged
Assignee: Bugzilla
Depends on:
Reported: 2014-08-28 09:52 UTC by Robert van der Boon
Modified: 2014-08-30 08:16 UTC (History)
2 users (show)

Is this bug a regression?: ---
Last known good build:

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Description Robert van der Boon 2014-08-28 09:52:56 UTC
Similar to #22417, but on DateTimeOffset:

DateTimeOffset ToString/TryParseExact does not round trip. I would have expected the following code to succeed:

using System;
using System.Globalization;
class P {
  static void Main(){
	string format = "r"; // with "s" it also fails.
	var dto = DateTimeOffset.UtcNow; // using .Now also fails.
	var s = dto.ToString(format, CultureInfo.InvariantCulture);
	Console.WriteLine("DTO ToString: {0}", s);
	DateTimeOffset dto2;
	bool parseExact = DateTimeOffset.TryParseExact(s, format, CultureInfo.InvariantCulture, DateTimeStyles.RoundtripKind, out dto2);
	if (parseExact)
	  Console.WriteLine("DTO Success! {0:s}={1}={2:s}", dto, s, dto2);
	  Console.WriteLine("DTO Fail! {0:s}={1} could not be parsed", dto, s);

Output on RHEL 5.8 / Mono 3.6.0 and 3.2.1:
DTO ToString: Thu, 28 Aug 2014 13:49:18 GMT
DTO Fail! 2014-08-28T15:49:18=Thu, 28 Aug 2014 13:49:18 GMT could not be parsed

If I use DateTime for ToString/TryParseExact instead of DateTimeOffset, then the output is Success.
Comment 1 Marek Safar 2014-08-30 08:16:52 UTC
Already fixed in master