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yesterday

Resolves yesterday to inclusive civil dates and exact UTC instants.

1|Updated Aug 23, 2026
Search Tags:#timezone#temporal#node#utc#yesterday#date resolution#iso date
One-click install
npx skills add https://github.com/foxmaster77/12BOT --skill yesterday-foxmaster77
Or copy as Structured Prompt for Agent▼
Please help me install this Agent Skill.
Skill: yesterday
Source: https://github.com/foxmaster77/12BOT/tree/main/munder-difflin-main/munder-difflin-main/resources/skills/yesterday
Command: npx skills add https://github.com/foxmaster77/12BOT --skill yesterday-foxmaster77

SYSTEM DOCUMENTATION & REQUIREMENTS

What problem does it solve? Manually computing yesterday's date range is error-prone across timezones and daylight saving boundaries. This Skill resolves "yesterday" to concrete, trustworthy date bounds so time-scoped tasks use correct temporal context without hand-derived dates. ## Core Features & Use Cases - Civil Date Range: Returns inclusive start and end dates (YYYY-MM-DD) in your local timezone. - UTC Instants: Provides startUtc and endExclusiveUtc as a half-open [start, end) range for timestamp-based queries. - Context Metadata: Includes days, timezone, and asOf so you know the span, timezone, and resolution time. - Use Case: Before generating a daily report or answering "what changed yesterday", run the resolver and use its returned dates as the query bounds instead of computing dates yourself. ## Quick Start Ask the assistant to resolve yesterday's date range using the yesterday skill before running a task scoped to yesterday, such as a daily change report.

Frequently Asked Questions about yesterday

High-intent search queries and answers about installing and using this skill.

FAQPage Schema
How do I get yesterday's date range programmatically?▼

Run the bundled resolver with node and the argument yesterday. It prints a human-readable line plus a JSON record containing start and end civil dates, UTC instants, timezone, and resolution time.

What date format does the yesterday resolver return?▼

It returns inclusive civil dates in YYYY-MM-DD format for your local timezone, plus startUtc and endExclusiveUtc as a half-open [start, end) range of exact UTC instants suitable for timestamp-based queries.

Does the yesterday skill handle timezone boundaries correctly?▼

Yes, the resolver is the designated source of truth and computes dates relative to your local timezone, avoiding manual errors around midnight and daylight saving transitions. Users are instructed not to derive dates by hand.

Can I resolve other date ranges besides yesterday?▼

The yesterday skill only resolves yesterday. For the full window list or arbitrary ranges such as last45days or last6months, use the companion temporal skill referenced in the documentation.

Does the yesterday resolver write files or access the network?▼

No, it is strictly read-only with no writes and no network access. It only computes and prints the resolved date range for the current run time.

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