ClaudSkills / Engineering / engineering-misc

immunize-timezone-naive-datetime

Q: What is a Claude Code skill and how does the immunize-timezone-naive-datetime skill fit in?

A Claude Code skill is a SKILL.md file that lives under ~/.claude/skills/<name>/ and tells the Claude Code CLI agent how to perform a specific task (instructions, prompts, allowed tools). Skills are auto-discovered at session start. immunize-timezone-naive-datetime is one of 67,000+ skills indexed in the open ClaudSkills catalog, classified under the Engineering category. Learn more at https://claudskills.com/learn/what-is-skill-md/.

Category: Engineering · Sub-category: engineering-misc · Last updated: 2026-05-21

lang:python

Use when writing Python code that calls datetime.now() or datetime.utcnow() and compares the result against a datetime that came from outside the process (HTTP API, database, JWT claim, etc.).

From the source SKILL.md

Always construct datetimes as offset-aware in UTC. Mixing naive and aware datetimes in a comparison or subtraction raises:

What this skill does

immunize-timezone-naive-datetime is a community-contributed Claude Code skill in the engineering-misc sub-category. It ships as a SKILL.md file that Claude Code auto-discovers under ~/.claude/skills/timezone-naive-datetime/ and loads when your prompt matches the skill's trigger.

When to invoke it: Use when writing Python code that calls datetime.now() or datetime.

Who uses this skill

The immunize-timezone-naive-datetime Claude Code skill is built for software engineers, backend developers, full-stack teams, and technical leads building and maintaining production systems. It's part of ClaudSkills (also referred to as Claude Skills or Claude Code Skills) — the open community-curated registry of 119,000+ SKILL.md files for Anthropic's Claude Code agent and the wider Claude ecosystem (Claude API, Claude Agent SDK).

How to install

Free

Manual install (2 steps)

mkdir -p ~/.claude/skills/timezone-naive-datetime
curl -L https://claudskills.com/skills/timezone-naive-datetime/SKILL.md \
  -o ~/.claude/skills/timezone-naive-datetime/SKILL.md

Or just download SKILL.md directly and drop it into ~/.claude/skills/timezone-naive-datetime/. Claude Code auto-discovers it on next session.

Skills live at ~/.claude/skills/timezone-naive-datetime/SKILL.md on macOS/Linux, or %USERPROFILE%\.claude\skills\timezone-naive-datetime\SKILL.md on Windows. See the full install guide for step-by-step instructions.

📱 Install from your phone or desktop Telegram

Open @claudskills_bot on Telegram, tap Open Desktop App, and the desktop app installs this skill for you. Or share the bot link with a colleague — they get the same one-tap install. Learn more →

Pro

One-click install via the desktop app

The ClaudSkills desktop app installs any skill directly into ~/.claude/skills/ with one click — no terminal required. Pro starts at $9/mo or $149 lifetime.

Pro

For the full experience including quality scoring and one-click install features for each skill — upgrade to Pro.

See pricing → Download desktop app

Frequently asked questions

How do I install the immunize-timezone-naive-datetime Claude Code skill?

Install via the ClaudSkills desktop app (one click) or copy SKILL.md from the source repository to ~/.claude/skills/timezone-naive-datetime/SKILL.md and restart Claude Code. Both flows are detailed at claudskills.com/install/.

What does the immunize-timezone-naive-datetime skill do?

Use when writing Python code that calls datetime.now() or datetime.utcnow() and compares the result against a datetime that came from outside the process (HTTP API, database, JWT claim, etc.).

Is this skill free to install?

Yes. ClaudSkills is an open registry — every skill keeps its source repository's license, and manual install via copy is free. ClaudSkills Pro ($9/mo, $79/yr, or $149 one-time) adds one-click install via the desktop app and a multi-signal Quality Score.

When should I use the immunize-timezone-naive-datetime skill?

Use immunize-timezone-naive-datetime when your Claude Code task falls under the Engineering category — specifically in the engineering misc area. Claude Code auto-discovers installed skills and invokes the right one based on the task description, so you can also ask Claude directly (e.g. "use immunize-timezone-naive-datetime" or describe the task and let Claude pick). Browse related skills at /category/engineering/.

What is a Claude Code skill and how does the immunize-timezone-naive-datetime skill fit in?

A Claude Code skill is a SKILL.md file that lives under ~/.claude/skills/<name>/ and tells the Claude Code CLI agent how to perform a specific task (instructions, prompts, allowed tools). Skills are auto-discovered at session start. immunize-timezone-naive-datetime is one of 67,000+ skills indexed in the open ClaudSkills catalog, classified under the Engineering category. Learn more at /learn/what-is-a-claude-skill/.

Cite this skill

If you reference this skill in a blog post, paper, or documentation, you can cite it as:

APA

ClaudSkills. (2026). immunize-timezone-naive-datetime [Claude Code skill]. ClaudSkills. https://claudskills.com/skills/timezone-naive-datetime/

BibTeX

@misc{timezone-naive-datetime-2026,
  author    = {ClaudSkills},
  title     = {immunize-timezone-naive-datetime [Claude Code skill]},
  year      = {2026},
  publisher = {ClaudSkills},
  url       = {https://claudskills.com/skills/timezone-naive-datetime/}
}

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