Rank, 14 days: 221 on the Claude Code sheet
2 people reported

All time, since Oct 21.

Wrong day of week

“It returned data but got the days of the week wrong”

Is this your bug? What gets counted gets fixed. Pile on.

Paste this into your agent. It files your report, with your error and version.

I hit this bug: rapsheet.dev/sheets/claude-code/issues/20548/file
Follow it to file my report. Show me the text before you send.

No install. No account. Public and anonymous. The link asks your agent for one report, nothing else. What it sends

Wrong day of week stated for given calendar dates. Weekdays for dates such as 23 Oct come back wrong; one reply says it "worked out the weekdays in my head instead of checking them".

Is this your bug?

File my report
Where
Model responses
Versions
2.1.306 to 2.1.317
Platforms
macOS, Windows
How bad
Breaks a normal workflow.

Original reports2, newest first

  1. Claude computes weekdays mentally instead of checking, producing wrong days of week#107195
  2. Model miscalculates day of week, states 10/23 is Thursday instead of Friday#104083

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