Sign sub-hour UTC offsets - #1872
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GetDateOffset took the sign from the hour component, which is zero for an offset of less than an hour, so TimeSpan.FromMinutes(-30) rendered as 0-30 while its positive twin rendered as +0-30. The sign now comes from the offset itself and the components are rendered unsigned. Only reachable with a constructed offset: no real timezone sits in that range.
SimonCropp
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Supersedes #1868, which GitHub closed automatically when its base branch (#1854) was deleted on merge. Same change, rebased onto
main.GetDateOffsettook the sign from the hour component. For an offset of less than an hour that component is zero, soTimeSpan.FromMinutes(-30)rendered as0-30while its positive twin rendered+0-30— the two are indistinguishable by sign, and a negative offset silently reads as positive.The sign now comes from the offset as a whole and the components are rendered unsigned. Every other case renders exactly as before:
-1-30,-5,+1-30,+5,+0.Only reachable with a constructed offset, since no real timezone sits in that range.
Built on top of #1854, so it keeps that PR's
FormattableString.Invariantstyle and its theory test untouched. One line of its comment changed: the sign is now written as a literal rather than taken from a negative number, so the culture pinning covers the digits rather than the sign.The rebase conflicted with #1856 (
SubMillisecondTicks, merged since), which appends tests at the same point inDateFormatterTests. Purely additive — both kept.DateFormatterTests.SubHourOffsetscovers both signs and asserts the two no longer render the same. Verified with a local run of the fullappveyor.ymlbuild script in Release on the merged result: build clean, all 17 test projects pass.