[BUG] stats-cache.json missing daily data for 2026-02-28

Preflight Checklist

• [x] I have searched existing issues and this hasn't been reported yet
• [x] This is a single bug report (please file separate reports for different bugs)
• [x] I am using the latest version of Claude Code

What's Wrong?

stats-cache.json has no entry for 2026-02-28 in either dailyActivity or dailyModelTokens, despite
multiple active CLI sessions that day. Surrounding dates are present and correct:

2026-02-27 — recorded (5,806 messages, 4 sessions)
2026-02-28 — missing
2026-03-01 — recorded (3,676 messages, 5 sessions)

The file's lastComputedDate is 2026-03-01. 2026 is not a leap year, so Feb 28 is the last day of the
month — possibly an edge case in end-of-February date handling.

Environment:

• Windows 11
• Claude Code CLI (Git Bash)
• stats-cache.json version: 2

What Should Happen?

the data should be there

Error Messages/Logs

Steps to Reproduce

Steps to reproduce:

1. Use Claude Code CLI on February 28 in a non-leap year
2. Use it again on March 1
3. Check ~/.claude/stats-cache.json — Feb 28 entry is absent

Note: I can't confirm whether this reproduces every non-leap year Feb 28 or was a one-time
occurrence. The end-of-February timing is the most obvious suspect.

Claude Model

Opus

Is this a regression?

I don't know

Last Working Version

_No response_

Claude Code Version

2.1.63

Platform

Anthropic API

Operating System

Windows

Terminal/Shell

Windows Terminal

Additional Information

<img width="1865" height="581" alt="Image" src="https://github.com/user-attachments/assets/c0963034-b880-43e7-b17a-085c9d0fcda5" />