Clinical Trials Database
google-deepmind/science-skills
Query ClinicalTrials.gov via APIv2. An agent skill from google-deepmind/science-skills.
Calculate medical date windows including gestational age, estimated delivery dates, and follow-up visit scheduling.
Install Date Calculator
$ npx skills add aipoch/medical-research-skills --skill date-calculator -a claude-codeProject install by default; add -g for ~/.claude/skills/.
$ gh skill install aipoch/medical-research-skills date-calculator --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/aipoch/medical-research-skills.git skills-src && mkdir -p .claude/skills && cp -r skills-src/scientific-skills/Other/date-calculator .claude/skills/date-calculator && 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 "date-calculator" agent skill from https://github.com/aipoch/medical-research-skills/tree/main/scientific-skills/Other/date-calculator into .claude/skills/date-calculator/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "date-calculator", 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/aipoch/medical-research-skills/tree/main/scientific-skills/Other/date-calculatorType 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 aipoch/medical-research-skills --skill date-calculator -a codexProject install goes to .agents/skills/; add -g for ~/.codex/skills/.
$ gh skill install aipoch/medical-research-skills date-calculator --agent codexProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/aipoch/medical-research-skills.git skills-src && mkdir -p .agents/skills && cp -r skills-src/scientific-skills/Other/date-calculator .agents/skills/date-calculator && rm -rf skills-srcUse ~/.agents/skills/ instead of .agents/skills for a personal install.
Codex skills documentation · loads skills from .agents/skills/
Install the "date-calculator" agent skill from https://github.com/aipoch/medical-research-skills/tree/main/scientific-skills/Other/date-calculator into .agents/skills/date-calculator/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "date-calculator", 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 aipoch/medical-research-skills --skill date-calculator -a cursorProject install goes to .agents/skills/; add -g for ~/.cursor/skills/.
$ gh skill install aipoch/medical-research-skills date-calculator --agent cursorProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/aipoch/medical-research-skills.git skills-src && mkdir -p .cursor/skills && cp -r skills-src/scientific-skills/Other/date-calculator .cursor/skills/date-calculator && 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 "date-calculator" agent skill from https://github.com/aipoch/medical-research-skills/tree/main/scientific-skills/Other/date-calculator into .cursor/skills/date-calculator/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "date-calculator", 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/aipoch/medical-research-skills.git --path scientific-skills/Other/date-calculator--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 aipoch/medical-research-skills --skill date-calculator -a gemini-cliProject install goes to .agents/skills/; add -g for ~/.gemini/skills/.
$ gh skill install aipoch/medical-research-skills date-calculator --agent gemini-cliProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/aipoch/medical-research-skills.git skills-src && mkdir -p .gemini/skills && cp -r skills-src/scientific-skills/Other/date-calculator .gemini/skills/date-calculator && 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 "date-calculator" agent skill from https://github.com/aipoch/medical-research-skills/tree/main/scientific-skills/Other/date-calculator into .gemini/skills/date-calculator/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "date-calculator", 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 aipoch/medical-research-skills date-calculatorInstalls 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 aipoch/medical-research-skills --skill date-calculator -a github-copilotProject install goes to .agents/skills/; add -g for ~/.copilot/skills/.
$ git clone --depth 1 https://github.com/aipoch/medical-research-skills.git skills-src && mkdir -p .github/skills && cp -r skills-src/scientific-skills/Other/date-calculator .github/skills/date-calculator && 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 "date-calculator" agent skill from https://github.com/aipoch/medical-research-skills/tree/main/scientific-skills/Other/date-calculator into .github/skills/date-calculator/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "date-calculator", 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 aipoch/medical-research-skills --skill date-calculator -a opencodeOpenCode documents no install command of its own. Project install goes to .agents/skills/; add -g for ~/.config/opencode/skills/.
$ gh skill install aipoch/medical-research-skills date-calculator --agent opencodeProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/aipoch/medical-research-skills.git skills-src && mkdir -p .opencode/skills && cp -r skills-src/scientific-skills/Other/date-calculator .opencode/skills/date-calculator && 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 "date-calculator" agent skill from https://github.com/aipoch/medical-research-skills/tree/main/scientific-skills/Other/date-calculator into .opencode/skills/date-calculator/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "date-calculator", 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
date-calculator- GitHub stars
- 2k
- Token cost
- ~1.3k tokens
- SKILL.md length
- 547 words
- Files
- 4 (incl. scripts, references)
- Skills in repo
- 567
- Repo updated
- First seen
- Licence
- MIT
At a glance
Calculate medical date windows including gestational age, estimated delivery dates, and follow-up visit scheduling.
- Works in 5 steps: Confirm the user objective, required… → Validate that the request matches the… → Use the packaged script path or the… → …
- Tasks that involve Clinical and healthcare research
- SKILL.md covers Quick Check, When to Use, Workflow and Parameters, plus 6 more sections
- Runs Python scripts from its folder; calls python
What it does
Date Calculator is an agent skill from aipoch/medical-research-skills. Calculate medical date windows including gestational age, estimated delivery dates, and follow-up visit scheduling. Produces structured JSON output for clinical research and trial coordination workflows.
Its SKILL.md is about 1.3k tokens, which your agent loads only when the skill is triggered. The skill folder holds 5 other files, including scripts and reference files (for example `date-calculator_audit_result_v2.json`, `references/guidelines.md` and `scripts/main.py`).
It sits in Research & Science, covering Clinical and healthcare research. The repository describes itself as: Hundreds of agent skills for medical research, including protocol design, data analysis, evidence insights, and academic writing. The licence is MIT.
When your agent uses it
- Tasks that involve Clinical and healthcare research
Example prompts
- “/date-calculator”
Requirements
- Python 3
Workflow steps
5 steps, taken from the first numbered list in SKILL.md.
- Confirm the user objective, required inputs, and non-negotiable constraints before doing detailed work.
- Validate that the request matches the documented scope and stop early if the task would require unsupported assumptions.
- Use the packaged script path or the documented reasoning path with only the inputs that are actually available.
- Return a structured result that separates assumptions, deliverables, risks, and unresolved items.
- If execution fails or inputs are incomplete, switch to the fallback path and state exactly what blocked full completion.
What it can do on your machine
Read from SKILL.md and the folder at commit 686e09d. It shows what the files ask for, not the result of running them.
Tool permissions
Pre-approves nothing: there is no allowed-tools line, so your agent's usual permission prompts apply.
From allowed-tools in the SKILL.md frontmatter.
Runs code
Ships 1 file in scripts/ (Python), which the agent can run.
Shell commands in SKILL.md call:
python
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
Date Calculator loads about 1.3k tokens when it runs, and up to ~1.3k if it reads all its reference files. Until then it costs about 55 tokens; SKILL.md has 547 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 passed
The automated check found no risky patterns in SKILL.md.
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); the scripts in this folder are not scanned.
SKILL.md
The full file from aipoch/medical-research-skills at commit 686e09d, republished under its MIT licence (© aipoch). 547 words, ~1,320 tokens.
Download SKILL.mdSave it as
.claude/skills/date-calculator/SKILL.md (or your agent's skills folder). This skill also uses 3 other files; get the full folder from GitHub.- name
- date-calculator
- description
- Calculate medical date windows including gestational age, estimated delivery dates, and follow-up visit scheduling. Produces structured JSON output for clinical research and trial coordination workflows.
- license
- MIT
- author
- AIPOCH
Date Calculator
Calculate medical date windows for clinical research: gestational age from LMP, estimated delivery dates, and follow-up visit scheduling with configurable window sizes.
Quick Check
python -m py_compile scripts/main.py
python scripts/main.py --helpWhen to Use
- Computing gestational age and estimated delivery date from last menstrual period
- Scheduling follow-up visit windows for clinical trials
- Generating date ranges for protocol-defined visit windows
Workflow
- Confirm the user objective, required inputs, and non-negotiable constraints before doing detailed work.
- Validate that the request matches the documented scope and stop early if the task would require unsupported assumptions.
- Use the packaged script path or the documented reasoning path with only the inputs that are actually available.
- Return a structured result that separates assumptions, deliverables, risks, and unresolved items.
- If execution fails or inputs are incomplete, switch to the fallback path and state exactly what blocked full completion.
Note on group parameter: If --group is not provided, log-rank test and Cox regression are skipped. Single-arm KM only. An informational note will be included in the output.
Fallback template: If scripts/main.py fails or a required parameter is absent, report: (a) which parameter is missing, (b) what partial calculation is still valid, (c) the manual formula for the requested calculation type.
Parameters
| Parameter | Type | Required | Description |
|---|---|---|---|
--type, -t | string | Yes | Calculation type: gestational or followup |
--date, -d | string | Yes | Reference date in YYYY-MM-DD format |
--weeks | int | No | Follow-up interval in weeks (default: 4; must be ≥ 1) |
--window-days | int | No | Visit window size in days (default: 7) |
--timezone | string | No | Timezone for calculation (default: UTC) |
--output, -o | string | No | Output JSON file path (default: stdout) |
Usage
# Gestational age from LMP
python scripts/main.py --type gestational --date 2024-01-15
# 4-week follow-up window
python scripts/main.py --type followup --date 2024-03-01
# Custom 6-week follow-up with ±5-day window
python scripts/main.py --type followup --date 2024-03-01 --weeks 6 --window-days 5Output Format
Gestational:
{
"lmp_date": "2024-01-15",
"gestational_age": "12 weeks 3 days",
"gestational_age_days": 87,
"estimated_delivery_date": "2024-10-21",
"calculation_date": "2024-04-12",
"warning": "LMP date is in the future; gestational age calculated from today may be negative or unexpected"
}Follow-up:
{
"start_date": "2024-03-01",
"followup_weeks": 4,
"window_start": "2024-03-29",
"window_end": "2024-04-05",
"window_range": "2024-03-29 to 2024-04-05"
}Output Requirements
Every response must make these explicit:
- Objective and deliverable
- Inputs used and assumptions introduced
- Workflow or decision path taken
- Core result: calculated dates and windows
- Constraints, risks, caveats (e.g., timezone assumptions, calendar edge cases)
- Unresolved items and next-step checks
Show full SKILL.md (235 more words)Show less
Input Validation
This skill accepts: medical date calculation requests specifying a calculation type (gestational or followup) and a reference date in YYYY-MM-DD format.
If the request does not involve medical date window calculation — for example, asking to schedule general appointments, perform time-zone conversions unrelated to clinical dates, or calculate non-medical intervals — do not proceed. Instead respond:
"
date-calculatoris designed to calculate medical date windows for clinical research. Your request appears to be outside this scope. Please provide a calculation type and reference date, or use a more appropriate tool for your task."
Validation rules:
- Date must be in
YYYY-MM-DDformat; invalid formats are rejected with exit code 1. - If LMP date is in the future, a
warningfield is included in the output. --weeksmust be ≥ 1; zero or negative values are rejected with a clear error message.--timezonedefaults to UTC; use pytz timezone names (e.g.,America/New_York).
Error Handling
- If required inputs are missing, state exactly which fields are missing and request only the minimum additional information.
- If the task goes outside the documented scope, stop instead of guessing or silently widening the assignment.
- If
scripts/main.pyfails, report the failure point, summarize what still can be completed safely, and provide a manual fallback. - Do not fabricate files, citations, data, search results, or execution outcomes.
Response Template
- Objective
- Inputs Received
- Assumptions
- Workflow
- Deliverable
- Risks and Limits
- Next Checks
© aipoch, 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 3 other files (scripts, references) in scientific-skills/Other/date-calculator of aipoch/medical-research-skills.
- SKILL.md
- date-calculator_audit_result_v2.json
- references/guidelines.md
- scripts/main.py
Open the folder on GitHubat commit 686e09d
Compare with similar skills
Date Calculator 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 |
|---|---|---|---|---|---|---|
| Date Calculator this skillaipoch/medical-research-skills | 2k | — | ~1.3k | Automated safety check: Pass | MIT | |
| Clinical Trials Databasegoogle-deepmind/science-skills | 3.2k | 3 repos | ~3.2k | Automated safety check: Pass | Apache-2.0 | |
| CHARLS Paper Reproduction Guidexjtulyc/MedgeClaw | 617 | 1 repos | ~1.8k | Automated safety check: Pass | None | |
| Model AssessmentAperivue/medsci-skills | 329 | 1 repos | ~4.5k | Automated safety check: Pass | MIT | |
| Biomedical Analysis Dispatchxjtulyc/MedgeClaw | 617 | 1 repos | ~2k | Automated safety check: Pass | None | |
| Research Proposalluwill/research-skills | 858 | — | ~4.4k | Automated safety check: Notes | None |
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Categories
Questions about Date Calculator
What does Date Calculator do?
Calculate medical date windows including gestational age, estimated delivery dates, and follow-up visit scheduling. Date Calculator is an agent skill from aipoch/medical-research-skills. Calculate medical date windows including gestational age, estimated delivery dates, and follow-up visit scheduling.
When should I use Date Calculator?
Date Calculator fits situations like: tasks that involve Clinical and healthcare research.
How do I install Date Calculator in Claude Code?
Run `npx skills add aipoch/medical-research-skills --skill date-calculator -a claude-code`. Or copy the skill folder (scientific-skills/Other/date-calculator in aipoch/medical-research-skills) into .claude/skills/date-calculator in your project. Claude Code loads it when a task matches its description.
How do I install Date Calculator in Codex?
Run `npx skills add aipoch/medical-research-skills --skill date-calculator -a codex`. Or copy the skill folder (scientific-skills/Other/date-calculator in aipoch/medical-research-skills) into .agents/skills/date-calculator in your project. Codex loads it when a task matches its description.
Can I use Date Calculator 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 aipoch/medical-research-skills --skill date-calculator -a cursor` (or -a gemini-cli, github-copilot or opencode for the others). To copy it by hand, put the folder in .cursor/skills/date-calculator, .gemini/skills/date-calculator, .github/skills/date-calculator and .opencode/skills/date-calculator in your project.
What does Date Calculator need to run?
Going by SKILL.md and its folder, Date Calculator needs Python for the scripts in its folder and the command-line tools its instructions call (python). Our summary lists: Python 3.
Does Date Calculator 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 Date Calculator safe to install?
Our automated static check of SKILL.md found no risky patterns, such as piping downloads into a shell, reading credential files or hidden Unicode. It is not a guarantee. The check reads SKILL.md only: the scripts in the folder are not scanned, so read them before running anything.
What licence does Date Calculator use?
Date Calculator is published under the MIT licence (declared in SKILL.md). It allows redistribution, so the full SKILL.md is shown on this page.
How many tokens does Date Calculator use?
About 1.3k tokens (SKILL.md is roughly 5.3k characters). Agents keep only the skill's name and description in context until a task matches; then they load SKILL.md in full. Its references folder adds about 28 tokens, read only when the agent opens those files.
What are the alternatives to Date Calculator?
Skills that share tags, products or a category with Date Calculator: Clinical Trials Database (google-deepmind/science-skills, 3.2k stars), CHARLS Paper Reproduction Guide (xjtulyc/MedgeClaw, 617 stars), Model Assessment (Aperivue/medsci-skills, 329 stars) and Biomedical Analysis Dispatch (xjtulyc/MedgeClaw, 617 stars). The comparison table on this page puts their stars, adoption, token cost, safety result and licence side by side.
Who maintains Date Calculator?
aipoch (a GitHub organization) maintains it in aipoch/medical-research-skills, which has 1,974 GitHub stars. The repository holds 567 skills in this directory. The repository was last updated on September 17, 2026.
Source: aipoch/medical-research-skills on GitHub. Facts on this page come from the repository at the commit we read; the author's words are quoted as theirs.