dsh-date-calc

Counting the days between two dates, adding or subtracting days from a baseline, or checking which day of the week a given date falls on—these look trivial until mental math starts producing off-by-one errors and you keep reaching for a calendar app, breaking your focus. dsh-date-calc wraps these three high-frequency date operations into ready-to-use tools so that date reasoning in a conversation no longer depends on any external application.

The plugin exposes three core tools: date_diff returns the number of days separating two dates; date_add adds or subtracts a specified number of days from a given date; weekday tells you the day of the week for any date. Everything is implemented in pure Node.js with zero external dependencies, keeping the tool lightweight and fully offline-capable.

Built for developers and knowledge workers whose daily workflows are heavy with deadlines, shift scheduling, attendance tracking, or any date-intensive task. Call the right tool right in the conversation, get a definitive answer, and keep your attention on the work that actually matters.