Vercel Composition Patterns
supabase/supabase
React composition patterns that scale. An agent skill from supabase/supabase.
Resolves a named time window like lastWeek, last30Days or lastQuarter into exact ISO start and end dates relative to the current moment, with no files written and no network calls.
Install Temporal Date Window Resolver
$ npx skills add HarnessMD/munder-difflin --skill temporal -a claude-codeProject install by default; add -g for ~/.claude/skills/.
$ gh skill install HarnessMD/munder-difflin temporal --agent claude-codeProject scope by default; add --scope user for a personal install. Needs GitHub CLI 2.90.0 or later (public preview).
$ git clone --depth 1 https://github.com/HarnessMD/munder-difflin.git skills-src && mkdir -p .claude/skills && cp -r skills-src/resources/skills/temporal .claude/skills/temporal && rm -rf skills-srcUse ~/.claude/skills/ instead of .claude/skills for a personal install. The folder must contain SKILL.md.
Claude Code skills documentation · loads skills from .claude/skills/
Install the "temporal" agent skill from https://github.com/HarnessMD/munder-difflin/tree/main/resources/skills/temporal into .claude/skills/temporal/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "temporal", then confirm the skill loads.Claude Code copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
$skill-installer install https://github.com/HarnessMD/munder-difflin/tree/main/resources/skills/temporalType this inside Codex. $skill-installer <name> installs a curated skill from openai/skills. The installer writes to $CODEX_HOME/skills (default ~/.codex/skills). Restart Codex if the skill does not show up.
$ npx skills add HarnessMD/munder-difflin --skill temporal -a codexProject install goes to .agents/skills/; add -g for ~/.codex/skills/.
$ gh skill install HarnessMD/munder-difflin temporal --agent codexProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/HarnessMD/munder-difflin.git skills-src && mkdir -p .agents/skills && cp -r skills-src/resources/skills/temporal .agents/skills/temporal && rm -rf skills-srcUse ~/.agents/skills/ instead of .agents/skills for a personal install.
Codex skills documentation · loads skills from .agents/skills/
Install the "temporal" agent skill from https://github.com/HarnessMD/munder-difflin/tree/main/resources/skills/temporal into .agents/skills/temporal/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "temporal", then confirm the skill loads.Codex copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
$ npx skills add HarnessMD/munder-difflin --skill temporal -a cursorProject install goes to .agents/skills/; add -g for ~/.cursor/skills/.
$ gh skill install HarnessMD/munder-difflin temporal --agent cursorProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/HarnessMD/munder-difflin.git skills-src && mkdir -p .cursor/skills && cp -r skills-src/resources/skills/temporal .cursor/skills/temporal && rm -rf skills-srcUse ~/.cursor/skills/ instead of .cursor/skills for a personal install.
Cursor skills documentation · loads skills from .cursor/skills/, .agents/skills/, .claude/skills/, .codex/skills/
Install the "temporal" agent skill from https://github.com/HarnessMD/munder-difflin/tree/main/resources/skills/temporal into .cursor/skills/temporal/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "temporal", then confirm the skill loads.Cursor copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
$ gemini skills install https://github.com/HarnessMD/munder-difflin.git --path resources/skills/temporal--scope user (default) or --scope workspace; --path is the subfolder of the repo that holds the skill; --consent skips the security confirmation prompt.
$ npx skills add HarnessMD/munder-difflin --skill temporal -a gemini-cliProject install goes to .agents/skills/; add -g for ~/.gemini/skills/.
$ gh skill install HarnessMD/munder-difflin temporal --agent gemini-cliProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/HarnessMD/munder-difflin.git skills-src && mkdir -p .gemini/skills && cp -r skills-src/resources/skills/temporal .gemini/skills/temporal && rm -rf skills-srcUse ~/.gemini/skills/ instead of .gemini/skills for a personal install, then run /skills reload.
Gemini CLI skills documentation · loads skills from .gemini/skills/, .agents/skills/
Install the "temporal" agent skill from https://github.com/HarnessMD/munder-difflin/tree/main/resources/skills/temporal into .gemini/skills/temporal/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "temporal", then confirm the skill loads.Gemini CLI copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
$ gh skill install HarnessMD/munder-difflin temporalInstalls for Copilot at project scope by default; add --scope user for a personal install. Preview a skill first with gh skill preview. Needs GitHub CLI 2.90.0 or later (public preview).
$ npx skills add HarnessMD/munder-difflin --skill temporal -a github-copilotProject install goes to .agents/skills/; add -g for ~/.copilot/skills/.
$ git clone --depth 1 https://github.com/HarnessMD/munder-difflin.git skills-src && mkdir -p .github/skills && cp -r skills-src/resources/skills/temporal .github/skills/temporal && rm -rf skills-srcUse ~/.copilot/skills/ instead of .github/skills for a personal install. Commit .github/skills so cloud agent and code review can use it.
GitHub Copilot skills documentation · loads skills from .github/skills/, .claude/skills/, .agents/skills/
Install the "temporal" agent skill from https://github.com/HarnessMD/munder-difflin/tree/main/resources/skills/temporal into .github/skills/temporal/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "temporal", then confirm the skill loads.GitHub Copilot copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
$ npx skills add HarnessMD/munder-difflin --skill temporal -a opencodeOpenCode documents no install command of its own. Project install goes to .agents/skills/; add -g for ~/.config/opencode/skills/.
$ gh skill install HarnessMD/munder-difflin temporal --agent opencodeProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/HarnessMD/munder-difflin.git skills-src && mkdir -p .opencode/skills && cp -r skills-src/resources/skills/temporal .opencode/skills/temporal && rm -rf skills-srcUse ~/.config/opencode/skills/ instead of .opencode/skills for a personal install.
OpenCode skills documentation · loads skills from .opencode/skills/, .claude/skills/, .agents/skills/
Install the "temporal" agent skill from https://github.com/HarnessMD/munder-difflin/tree/main/resources/skills/temporal into .opencode/skills/temporal/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "temporal", then confirm the skill loads.OpenCode copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
Facts
- Skill name
temporal- GitHub stars
- 8.6k
- Token cost
- ~742 tokens
- SKILL.md length
- 258 words
- Files
- 2
- Skills in repo
- 7
- Repo updated
- First seen
- Licence
- MIT
At a glance
Resolves a named time window like lastWeek, last30Days or lastQuarter into exact ISO start and end dates relative to the current moment, with no files written and no network calls.
- Getting the exact date range for lastWeek or lastQuarter before running a report
- Runs JavaScript scripts from its folder; calls node
- Converting a relative time phrase into concrete start and end timestamps for a query
- Checking what today or yesterday means in the current timezone
What it does
Running the bundled when.mjs script with no arguments dumps every supported window at once; a single window name narrows the output. Supported keywords cover today and yesterday, this and last versions of week, month, quarter and year, rolling windows like last7Days, last30Days, last90Days and last12Months, and an arbitrary lastNdays, lastNweeks or lastNmonths form such as last45days, plus short aliases like ytd, qtd, mtd and 7d.
The stated convention is that this* windows run from the period's start up to today, while last* windows are the complete prior period, such as the full previous calendar month rather than a rolling 30 days. Each resolved window prints both a human-readable line and a JSON record with inclusive local start and end dates, a half-open UTC range suited to timestamp comparisons, the span in days, the timezone and offset, and the instant the range was resolved, so a task can use exact dates without computing them by hand.
When your agent uses it
- Getting the exact date range for lastWeek or lastQuarter before running a report
- Converting a relative time phrase into concrete start and end timestamps for a query
- Checking what today or yesterday means in the current timezone
Example prompts
- “What are the exact dates for lastQuarter right now?”
- “Resolve last45days into a start and end date I can use in a query.”
- “/temporal thisMonth”
Requirements
- Node.js, to run when.mjs
- Pre-approved tools (allowed-tools): Bash
What it can do on your machine
Read from SKILL.md and the folder at commit 7d38335. It shows what the files ask for, not the result of running them.
Tool permissions
Pre-approves these tools, so the agent can use them without asking each time:
Bash
From allowed-tools in the SKILL.md frontmatter.
Runs code
Ships script files (JavaScript), which the agent can run.
Shell commands in SKILL.md call:
node
From the folder's file list and the shell code blocks in SKILL.md.
Network
No URLs in SKILL.md.
From URLs in SKILL.md, links to its own repository left out.
Credentials
Names no API keys, tokens, secrets or passwords.
From names ending in _API_KEY, _TOKEN, _SECRET, _KEY or _PASSWORD in SKILL.md.
Context cost
Temporal Date Window Resolver loads about 742 tokens when it runs. Until then it costs about 112 tokens; SKILL.md has 258 words of instructions outside code blocks.
Estimates: characters ÷ 4, the usual rule of thumb; real counts depend on the model's tokenizer. Scripts and assets cost tokens only if the agent reads them.
Safety
Auto-check: notes
The automated check noted patterns worth knowing about, such as sudo or a known installer.
- NotePre-approves every shell command (allowed-tools: Bash)SKILL.md
allowed-tools: Bash
Automated static check — not a guarantee. Review scripts before installing. It scans the text of SKILL.md for risky patterns (piping downloads into a shell, reading credential files, hidden Unicode, destructive commands); files beside SKILL.md are not scanned.
SKILL.md
The full file from HarnessMD/munder-difflin at commit 7d38335, republished under its MIT licence (© HarnessMD). 258 words, ~742 tokens.
Download SKILL.mdSave it as
.claude/skills/temporal/SKILL.md (or your agent's skills folder). This skill also uses 1 other file; get the full folder from GitHub.- name
- temporal
- description
- Resolve ANY named time window — today, yesterday, thisWeek, lastWeek, last7Days, last30Days, last90Days, thisMonth, lastMonth, thisQuarter, lastQuarter, thisYear, lastYear, last12Months — or an arbitrary range (lastNdays / lastNweeks / lastNmonths) to a concrete ISO date range relative to your run time. Read-only: no writes, no network. Use whenever a task is time-scoped and you need exact start/end dates without computing them by hand.
- allowed-tools
- Bash
/temporal — concrete date ranges, relative to now
This is the single source of truth for "what dates does <window> mean right
now?". It resolves named windows to concrete ISO date ranges relative to your
run time (new Date() at the moment you invoke it), so you never re-derive
dates manually. It only reads the clock and prints — no files written, no network.
Run it
# all windows at once (a quick temporal-context dump)
node "$AGENT_DIR/.claude/skills/temporal/when.mjs"
# one or several specific windows
node "$AGENT_DIR/.claude/skills/temporal/when.mjs" last30Days thisQuarter
# JSON only (machine-readable), or list the supported keywords
node "$AGENT_DIR/.claude/skills/temporal/when.mjs" --json last7Days
node "$AGENT_DIR/.claude/skills/temporal/when.mjs" --listIf $AGENT_DIR is somehow unset, the script also lives under
~/.claude/skills/temporal/when.mjs.
Windows
| Keyword | Meaning |
|---|---|
today / yesterday | the single civil day |
thisWeek / lastWeek | ISO week (Mon-start); this = Mon→today, last = the full prior Mon→Sun |
last7Days / last30Days / last90Days | rolling N-day window ending today (inclusive) |
thisMonth / lastMonth | this = 1st→today; last = the full prior calendar month |
thisQuarter / lastQuarter | this = quarter-start→today; last = the full prior quarter |
thisYear / lastYear | this = Jan 1→today (YTD); last = the full prior year |
last12Months | rolling 12 months ending today |
lastNdays / lastNweeks / lastNmonths | arbitrary rolling window, e.g. last45days, last2weeks, last6months |
Aliases: ytd, qtd, mtd, wtd, 7d, 30d, 90d, 12m.
Convention: this* windows are period-start → today (to-date); last*
named periods are the full prior complete period.
Output
Each window prints a human line plus a JSON record:
start/end— inclusive civil dates (YYYY-MM-DD) in your local timezonestartUtc/endExclusiveUtc— the same span as a half-open[start, end)range of exact UTC instants, ideal for timestamp /createdAt-style queriesdays,inclusive,timezone,tzOffsetMinutes,asOf— span, tz, and the instant the range was resolved
Use the returned dates as the time bounds for the task. The named shortcuts
/today, /yesterday, /last30Days, /lastQuarter, … each call this same
resolver for their one window.
© HarnessMD, MIT. Rendered from Markdown: HTML in the file is shown as text, images as links, and headings moved down two levels. Raw file
Files
SKILL.md and 1 other file in resources/skills/temporal of HarnessMD/munder-difflin.
- SKILL.md
- when.mjs
Open the folder on GitHubat commit 7d38335
Compare with similar skills
Temporal Date Window Resolver next to the 5 skills that share the most tags, products or categories with it. Stars are the repository's; “used in” counts other GitHub owners with a copy.
| Skill | Stars | Used in | Tokens | Auto-check | Licence | Repo updated |
|---|---|---|---|---|---|---|
| Temporal Date Window Resolver this skillHarnessMD/munder-difflin | 8.6k | — | ~742 | Automated safety check: Notes | MIT | |
| Vercel Composition Patternssupabase/supabase | 111k | 59 repos | ~726 | Automated safety check: Pass | MIT | |
| Finishing a Development Branchobra/superpowers | 296k | 5 repos | ~1.9k | Automated safety check: Pass | MIT | |
| Typescript Advanced Typesrolling-scopes/rsschool-app | 10k | 25 repos | ~4.2k | Automated safety check: Pass | MPL-2.0 | |
| PR Babysitteropeninterpreter/openinterpreter | 69k | 3 repos | ~4.2k | Automated safety check: Pass | Apache-2.0 | |
| Code Review ChecklistshareAI-lab/learn-claude-code | 78k | 5 repos | ~1.1k | Automated safety check: Pass | MIT |
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Categories
Questions about Temporal Date Window Resolver
What does Temporal Date Window Resolver do?
Resolves a named time window like lastWeek, last30Days or lastQuarter into exact ISO start and end dates relative to the current moment, with no files written and no network calls. mjs script with no arguments dumps every supported window at once; a single window name narrows the output. Supported keywords cover today and yesterday, this and last versions of week, month, quarter and year, rolling windows like last7Days, last30Days, last90Days and last12Months, and an arbitrary lastNdays, lastNweeks or lastNmonths form such as last45days, plus short aliases like ytd, qtd, mtd and 7d.
When should I use Temporal Date Window Resolver?
Temporal Date Window Resolver fits situations like: getting the exact date range for lastWeek or lastQuarter before running a report; converting a relative time phrase into concrete start and end timestamps for a query; checking what today or yesterday means in the current timezone.
How do I install Temporal Date Window Resolver in Claude Code?
Run `npx skills add HarnessMD/munder-difflin --skill temporal -a claude-code`. Or copy the skill folder (resources/skills/temporal in HarnessMD/munder-difflin) into .claude/skills/temporal in your project. Claude Code loads it when a task matches its description.
How do I install Temporal Date Window Resolver in Codex?
Run `npx skills add HarnessMD/munder-difflin --skill temporal -a codex`. Or copy the skill folder (resources/skills/temporal in HarnessMD/munder-difflin) into .agents/skills/temporal in your project. Codex loads it when a task matches its description.
Can I use Temporal Date Window Resolver in Cursor, Gemini CLI or GitHub Copilot?
Cursor, Gemini CLI, GitHub Copilot and OpenCode also load SKILL.md folders. With the skills CLI, run `npx skills add HarnessMD/munder-difflin --skill temporal -a cursor` (or -a gemini-cli, github-copilot or opencode for the others). To copy it by hand, put the folder in .cursor/skills/temporal, .gemini/skills/temporal, .github/skills/temporal and .opencode/skills/temporal in your project.
What does Temporal Date Window Resolver need to run?
Going by SKILL.md and its folder, Temporal Date Window Resolver needs JavaScript for the scripts in its folder and the command-line tools its instructions call (node). Our summary lists: Node.js, to run when.mjs. Its frontmatter pre-approves these tools: Bash.
Does Temporal Date Window Resolver access the network?
SKILL.md contains no URLs. Any network use would come from the scripts or tools the agent runs. This is read from the text; nothing was executed.
Is Temporal Date Window Resolver safe to install?
Our automated static check of SKILL.md found notes only (pre-approves every shell command (allowed-tools: bash)), nothing it rates as a warning. It is not a guarantee. Review the folder before installing.
What licence does Temporal Date Window Resolver use?
Temporal Date Window Resolver is published under the MIT licence (the repository's licence). It allows redistribution, so the full SKILL.md is shown on this page.
How many tokens does Temporal Date Window Resolver use?
About 742 tokens (SKILL.md is roughly 3k characters). Agents keep only the skill's name and description in context until a task matches; then they load SKILL.md in full.
What are the alternatives to Temporal Date Window Resolver?
Skills that share tags, products or a category with Temporal Date Window Resolver: Vercel Composition Patterns (supabase/supabase, 111k stars), Finishing a Development Branch (obra/superpowers, 296k stars), Typescript Advanced Types (rolling-scopes/rsschool-app, 10k stars) and PR Babysitter (openinterpreter/openinterpreter, 69k stars). The comparison table on this page puts their stars, adoption, token cost, safety result and licence side by side.
Who maintains Temporal Date Window Resolver?
HarnessMD (a GitHub organization) maintains it in HarnessMD/munder-difflin, which has 8,567 GitHub stars. The repository holds 7 skills in this directory. The repository was last updated on October 8, 2026.
Source: HarnessMD/munder-difflin on GitHub. Facts on this page come from the repository at the commit we read; the author's words are quoted as theirs.