MCP Time Server Node

const { formatRelative, parseISO } = require('date-fns'); const { toDate, formatInTimeZone } = require('date-fns-tz'); console.log('Debugging formatRelative timezone issue\n'); // The problematic date from the test const dateStr = '2024-01-01T09:30:00.000Z'; const date = parseISO(dateStr); // Current time (for testing) const now = new Date(); console.log('Test Date:', date.toISOString()); console.log('Current Date:', now.toISOString()); console.log(''); // Test the current implementation approach console.log('=== Current Implementation Approach ==='); function currentImplementation(timezone) { console.log(`\nTimezone: ${timezone}`); // This is what the current code does const zonedDate = toDate(date, { timeZone: timezone }); const zonedNow = toDate(now, { timeZone: timezone }); console.log('Step 1 - toDate results:'); console.log(' zonedDate:', zonedDate.toISOString()); console.log(' zonedNow:', zonedNow.toISOString()); console.log(' Are they the same as original?', zonedDate.toISOString() === date.toISOString()); // Calculate time difference const timeDiff = zonedDate.getTime() - zonedNow.getTime(); console.log('\nStep 2 - Time difference:', timeDiff, 'ms'); // Create adjusted date const adjustedDate = new Date(Date.now() + timeDiff); console.log('\nStep 3 - Adjusted date:', adjustedDate.toISOString()); // Format relative const result = formatRelative(adjustedDate, new Date()); console.log('\nStep 4 - formatRelative result:', result); // What it should show const correctTime = formatInTimeZone(date, timezone, 'h:mm a'); const correctDay = formatInTimeZone(date, timezone, 'EEEE'); console.log('\nWhat it SHOULD show:'); console.log(` Time in ${timezone}:`, correctTime); console.log(` Day in ${timezone}:`, correctDay); } currentImplementation('America/New_York'); currentImplementation('Asia/Tokyo'); currentImplementation('UTC'); console.log('\n=== The Problem ==='); console.log('1. toDate with timezone option does NOT convert the date to that timezone'); console.log('2. It returns the SAME date object (check the boolean above)'); console.log('3. formatRelative always uses the SYSTEM timezone, not the dates passed'); console.log('4. The adjustedDate calculation creates a future date, not the correct relative date'); console.log('\n=== The Solution ==='); console.log('We need to implement our own relative formatting that:'); console.log('1. Calculates the day difference correctly'); console.log('2. Formats the time in the target timezone'); console.log('3. Builds the relative string manually'); console.log('\n=== Correct Implementation ==='); function correctImplementation(date, baseDate, timezone) { console.log(`\nTimezone: ${timezone}`); // Format the time in the target timezone const timeStr = formatInTimeZone(date, timezone, 'h:mm a'); const dayOfWeek = formatInTimeZone(date, timezone, 'EEEE'); // Calculate days between dates (in UTC, which is correct) const msPerDay = 24 * 60 * 60 * 1000; const startOfDayDate = new Date(date.getFullYear(), date.getMonth(), date.getDate()); const startOfDayBase = new Date(baseDate.getFullYear(), baseDate.getMonth(), baseDate.getDate()); const daysDiff = Math.round((startOfDayDate - startOfDayBase) / msPerDay); console.log(' Days difference:', daysDiff); console.log(' Time in timezone:', timeStr); console.log(' Day of week:', dayOfWeek); // Build relative string let result; if (daysDiff === 0) { result = `today at ${timeStr}`; } else if (daysDiff === -1) { result = `yesterday at ${timeStr}`; } else if (daysDiff === 1) { result = `tomorrow at ${timeStr}`; } else if (daysDiff >= -6 && daysDiff < -1) { result = `last ${dayOfWeek} at ${timeStr}`; } else if (daysDiff > 1 && daysDiff < 7) { result = `${dayOfWeek} at ${timeStr}`; } else { result = formatInTimeZone(date, timezone, 'MM/dd/yyyy'); } console.log(' Result:', result); return result; } // Test with a base date 2 days after our test date const baseDate = new Date('2024-01-03T14:00:00Z'); correctImplementation(date, baseDate, 'America/New_York'); correctImplementation(date, baseDate, 'Asia/Tokyo'); correctImplementation(date, baseDate, 'UTC');