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Sign sub-hour UTC offsets - #1872

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fix-negative-subhour-offset
Aug 17, 2026
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Sign sub-hour UTC offsets#1872
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fix-negative-subhour-offset

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Supersedes #1868, which GitHub closed automatically when its base branch (#1854) was deleted on merge. Same change, rebased onto main.

GetDateOffset took the sign from the hour component. For an offset of less than an hour that component is zero, so TimeSpan.FromMinutes(-30) rendered as 0-30 while 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.Invariant style 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 in DateFormatterTests. Purely additive — both kept.

DateFormatterTests.SubHourOffsets covers both signs and asserts the two no longer render the same. Verified with a local run of the full appveyor.yml build script in Release on the merged result: build clean, all 17 test projects pass.

@SimonCropp SimonCropp added this to the 32.0.0 milestone Aug 17, 2026
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
SimonCropp force-pushed the fix-negative-subhour-offset branch from 4f6d25c to f45f2a6 Compare August 17, 2026 13:41
@SimonCropp
SimonCropp merged commit 175b49d into main Aug 17, 2026
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@SimonCropp
SimonCropp deleted the fix-negative-subhour-offset branch August 17, 2026 21:18
@SimonCropp
SimonCropp restored the fix-negative-subhour-offset branch August 17, 2026 21:25
This was referenced Aug 26, 2026
This was referenced Aug 27, 2026
tom-wolfe pushed a commit to tom-wolfe/Wolfe.CommandLine that referenced this pull request Aug 27, 2026
Updated [Verify.XunitV3](https://github.com/VerifyTests/Verify) from
31.28.0 to 32.0.0.

<details>
<summary>Release notes</summary>

_Sourced from [Verify.XunitV3's
releases](https://github.com/VerifyTests/Verify/releases)._

## 32.0.0

- [x] [#​1832](VerifyTests/Verify#1832) Add
Inline snpashot support
- [x] [#​1835](VerifyTests/Verify#1835) Add
SettingsTask.AddContext
- [x] [#​1847](VerifyTests/Verify#1847) Honor
explicit DefaultValueHandling for bools
- [x] [#​1850](VerifyTests/Verify#1850) Stray
extension-less snapshot file crashes every run of its test
- [x] [#​1851](VerifyTests/Verify#1851) Static
UniqueForTargetFramework(Assembly) overloads ignore the assembly passed
to them
- [x] [#​1852](VerifyTests/Verify#1852)
Appended files skip scrubbing and newline normalization when a stream
converter is registered
- [x] [#​1853](VerifyTests/Verify#1853)
IgnoreParameters() ignore-all sentinel is lost when combined with
another ignore source
- [x] [#​1854](VerifyTests/Verify#1854) Format
UTC offsets with the invariant culture
- [x] [#​1855](VerifyTests/Verify#1855) Format
UTC offsets with invariant culture
- [x] [#​1856](VerifyTests/Verify#1856) Use
ticks to decide date precision
- [x] [#​1857](VerifyTests/Verify#1857) Clean #
out of file name parameters
- [x] [#​1858](VerifyTests/Verify#1858) Escape
one character trimmed date formats
- [x] [#​1859](VerifyTests/Verify#1859) Prefer
the exact type when resolving a member converter
- [x] [#​1860](VerifyTests/Verify#1860) Keep
empty collections ignored alongside instance predicates
- [x] [#​1861](VerifyTests/Verify#1861) Key the
combinations name cache by reference
- [x] [#​1862](VerifyTests/Verify#1862) Match
MSTest overloads against the test data
- [x] [#​1863](VerifyTests/Verify#1863) Report
deletes as directory relative paths
- [x] [#​1864](VerifyTests/Verify#1864) Name the
guarded API in ThrowIfVerifyHasBeenRun
- [x] [#​1865](VerifyTests/Verify#1865) Keep
stack frames that have no parameter list
- [x] [#​1866](VerifyTests/Verify#1866) Generate
the TestContext property for record test classes
- [x] [#​1867](VerifyTests/Verify#1867) Fix two
CombinationResultsConverter edge cases
- [x] [#​1868](VerifyTests/Verify#1868) Sign
sub-hour UTC offsets
- [x] [#​1869](VerifyTests/Verify#1869) Write
the received file from the stream for handle based FileStreams
- [x] [#​1870](VerifyTests/Verify#1870) Compare
prefixes ignoring case
- [x] [#​1871](VerifyTests/Verify#1871) Guard
the counter value caches with a lock
- [x] [#​1872](VerifyTests/Verify#1872) Sign
sub-hour UTC offsets

## 32.0.0-beta.16



## 32.0.0-beta.15



## 32.0.0-beta.14



## 32.0.0-beta.13



## 32.0.0-beta.12



## 32.0.0-beta.10



## 32.0.0-beta.8



## 32.0.0-beta.7



## 32.0.0-beta.6



## 32.0.0-beta.5



## 32.0.0-beta.4



## 32.0.0-beta.3



## 32.0.0-beta.2



## 32.0.0-beta.1



Commits viewable in [compare
view](VerifyTests/Verify@31.28.0...32.0.0).
</details>

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