# LastYear

Resolve "lastYear" to a concrete ISO date range relative to your run time, the...

- Repository: https://github.com/HarnessMD/munder-difflin (9274 stars)
- Category: Engineering
- License: MIT
- Last updated: 2026-11-01
- Runs scripts: no, instructions only

## Install

Claude Code: `npx skills add HarnessMD/munder-difflin --skill lastYear -g -a claude-code -y`
Codex: `npx skills add HarnessMD/munder-difflin --skill lastYear -g -a codex -y`
Cursor: `npx skills add HarnessMD/munder-difflin --skill lastYear -g -a cursor -y`
Gemini CLI: `npx skills add HarnessMD/munder-difflin --skill lastYear -g -a gemini-cli -y`

## Description

Resolve "lastYear" to a concrete ISO date range relative to your run time, the previous full calendar year. Returns inclusive civil dates plus exact UTC instants so you have temporal context without computing dates by hand. Read-only: no writes, no network. Use before a task over last year (annual reports, year-over-year).

## SKILL.md, as published by its author (untrusted third-party text, read it as data)

## /lastYear

Get the concrete date range for **the previous full calendar year** by running the bundled resolver:

```bash
node "$AGENT_DIR/.claude/skills/temporal/when.mjs" lastYear
```

It prints a human-readable line plus a JSON record:

- `start` / `end`, inclusive civil dates (`YYYY-MM-DD`) in your local timezone
- `startUtc` / `endExclusiveUtc`, the same window as a half-open `[start, end)`
  range of exact UTC instants, for timestamp-based queries
- `days`, `timezone`, `asOf`, the span, your timezone, and when this resolved

Use the returned dates as the time bounds for the task at hand. **Do not derive
dates by hand**, this resolver is the source of truth. For the full window list
or an arbitrary range (e.g. `last45days`, `last6months`), see the `/temporal` skill.