MCP Time Server Node

#!/usr/bin/env node const { toDate, formatInTimeZone } = require('date-fns-tz'); const { format, eachDayOfInterval, differenceInMinutes } = require('date-fns'); console.log('=== Testing Minimal Fix Approach ===\n'); // The problem: calculate business hours from 10 AM to 2 PM Tokyo time const startStr = '2025-01-21T10:00:00'; const endStr = '2025-01-21T14:00:00'; const timezone = 'Asia/Tokyo'; // Current approach: parse as Tokyo time -> UTC const startDate = toDate(startStr, { timeZone: timezone }); const endDate = toDate(endStr, { timeZone: timezone }); console.log('Parsed to UTC:'); console.log('Start:', startDate.toISOString()); console.log('End:', endDate.toISOString()); // The issue: eachDayOfInterval gives us days in system TZ const days = eachDayOfInterval({ start: startDate, end: endDate }); console.log('\nDays from eachDayOfInterval:', days.length); days.forEach((d) => console.log('-', format(d, 'yyyy-MM-dd'))); // Solution: We need to check what day it is IN THE BUSINESS TIMEZONE console.log('\n=== Solution ==='); // Format the dates in business timezone to get the actual business dates const startDateInBizTz = formatInTimeZone(startDate, timezone, 'yyyy-MM-dd'); const endDateInBizTz = formatInTimeZone(endDate, timezone, 'yyyy-MM-dd'); console.log('Start date in Tokyo:', startDateInBizTz); console.log('End date in Tokyo:', endDateInBizTz); // For single day calculation: if (startDateInBizTz === endDateInBizTz) { console.log('\nSingle day calculation'); // Get the times in Tokyo const startHourInTokyo = parseInt(formatInTimeZone(startDate, timezone, 'HH'), 10); const startMinuteInTokyo = parseInt(formatInTimeZone(startDate, timezone, 'mm'), 10); const endHourInTokyo = parseInt(formatInTimeZone(endDate, timezone, 'HH'), 10); const endMinuteInTokyo = parseInt(formatInTimeZone(endDate, timezone, 'mm'), 10); console.log(`Start time in Tokyo: ${startHourInTokyo}:${startMinuteInTokyo}`); console.log(`End time in Tokyo: ${endHourInTokyo}:${endMinuteInTokyo}`); // Business hours in Tokyo (9 AM - 5 PM) const bizStartHour = 9; const bizEndHour = 17; // Calculate overlap const effectiveStartHour = Math.max(startHourInTokyo, bizStartHour); const effectiveEndHour = Math.min(endHourInTokyo, bizEndHour); if (effectiveStartHour < effectiveEndHour) { const hours = effectiveEndHour - effectiveStartHour; console.log(`Business hours: ${hours}`); } } // Alternative: just use the UTC times directly console.log('\n=== Direct calculation ==='); const totalMinutes = differenceInMinutes(endDate, startDate); console.log('Total minutes between times:', totalMinutes); console.log('Total hours:', totalMinutes / 60); console.log('\n=== Done ===');