MCP Time Server Node

import { addDays, isAfter, setHours, setMinutes, setSeconds, setMilliseconds } from 'date-fns'; import { fromZonedTime, toZonedTime } from 'date-fns-tz'; import type { RecurrencePattern, DailyParams } from '../../types/recurrence'; export class DailyRecurrence implements RecurrencePattern { calculate(from: Date, params: DailyParams): Date { const timezone = params.timezone ?? 'UTC'; const time = params.time; if (!time) { // No specific time, just add one day return addDays(from, 1); } // Parse time string const [hours, minutes] = time.split(':').map(Number); if (timezone === '' || timezone === 'UTC') { return this.calculateInUTC(from, hours, minutes); } return this.calculateInTimezone(from, hours, minutes, timezone); } private calculateInUTC(from: Date, hours: number, minutes: number): Date { const result = new Date(from); result.setUTCHours(hours); result.setUTCMinutes(minutes); result.setUTCSeconds(0); result.setUTCMilliseconds(0); // If the time has already passed or is exactly now, move to tomorrow if (!isAfter(result, from)) { return addDays(result, 1); } return result; } private calculateInTimezone(from: Date, hours: number, minutes: number, timezone: string): Date { // Convert to target timezone const zonedFrom = toZonedTime(from, timezone); // Set the time in the timezone let result = new Date(zonedFrom); result = setHours(result, hours); result = setMinutes(result, minutes); result = setSeconds(result, 0); result = setMilliseconds(result, 0); // If the time has already passed or is exactly now, move to tomorrow if (!isAfter(result, zonedFrom)) { result = addDays(result, 1); } // Convert back to UTC return fromZonedTime(result, timezone); } }