DateTimePicker lose leading 0 in milliseconds when lose focus.

Open

#1,796 opened on Apr 28, 2025 2 comments 0 reactions 0 assignees View on GitHub

Nobody has claimed this yet.

Assessment

Difficulty: 2/5
Estimated time: 1-3 hours
Newbie friendliness: 58/100

Issue type: Bug
Clarity: Clearly specified
Activity status: Stale
Tech stack: csharp
Domain: desktop

Research direction

Start in ExtendedWPFToolkitSolution/Src/Xceed.Wpf.Toolkit/DateTimeUpDown/Implementation/DateTimeParser.cs, at ComputeDateTimeString and its millisecondsPart calculation. Reproduce the focus-loss case with 28.04.2025 16:26:16.080 and inspect the resulting value. Done means the leading zero is preserved after the DateTimePicker loses focus.

Written by the indexing model from the issue text.

Description

Error location

https://github.com/xceedsoftware/wpftoolkit/blob/master/ExtendedWPFToolkitSolution/Src/Xceed.Wpf.Toolkit/DateTimeUpDown/Implementation/DateTimeParser.cs

DateTimeParser.cs

private static string ComputeDateTimeString( string dateTime, string format, DateTime currentDate, CultureInfo cultureInfo, bool autoClipTimeParts )

//Has error here.
string millisecondsPart = currentDate.Millisecond.ToString();

Case

If picker has dateTime value like this '28.04.2025 16:26:16.080'

millisecondsPart = "80";

We have lost leading 0.

in the end we have a result like this '28.04.2025 16:26:16.80'

'28.04.2025 16:26:16.80' == '28.04.2025 16:26:16.800'
'28.04.2025 16:26:16.80' != '28.04.2025 16:26:16.080'

Summary

Control lost focus and value changed.

Dominant language: C#
Stars: 4.2k
Forks: 912
PR merge metrics: No merged PRs in 30d

Contributor guide

No contributing guide indexed for this repository

First steps

Read the whole issue, then the project's contributing guide.
Comment on the issue to say you are picking it up — it saves two people doing the same work.
Fork the repository and make your change on a branch.
Open a pull request that references the issue number.

Similar issues

[quality-improver] Repository Quality: AzureFoundry Extension Missing from Self-Registration Acceptance Test Open

type/automation type/tech-debt

Difficulty 2/5 1-3 hours Newbie friendliness 78/100

microsoft/testfx#11431 · Opened Sep 21, 2026
[Bug]: Composite `ui screenshot` success output ignores `--quiet` Open

bug

Difficulty 2/5 1-3 hours Newbie friendliness 88/100

microsoft/winappCli#914 · Opened Sep 21, 2026
GeometryHelper.FlattenArc / FlattenCubicBezier / FlattenQuadraticBezier emit a NaN point when the segment count truncates to 0 (0/0) — a Path with a sub-pixel arc fail-fasts Windows with D2DERR_BAD_NUMBER (root cause of #8512, #13757) Open

t/bug

Difficulty 2/5 1-3 hours Newbie friendliness 82/100

dotnet/maui#38751 · 1 reaction · Opened Sep 21, 2026
[CI Failure] Flaky: MauiBuildQueueTests.CancelQueuedResource_CompletesGracefullyAndDoesNotAcquireSemaphore asserts exact exception type but sometimes gets TaskCanceledException instead of OperationCanceledException Open

ci-failure-cause test-failure

Difficulty 2/5 1-3 hours Newbie friendliness 82/100

microsoft/aspire#20284 · Opened Sep 21, 2026
The login flow's text-link submit is 42 px tall on a narrow screen; its docblock says 44 Open

area:auth FE mvp P3

Difficulty 2/5 1-3 hours Newbie friendliness 88/100

klasolsson81/jobbliggaren#1788 · Opened Sep 21, 2026

More C# issues