MCP Time Server Node

#!/usr/bin/env node /** * Additional research on TZ environment variable interaction */ console.log('=== TZ Environment Variable Research ===\n'); // Save original TZ const originalTZ = process.env.TZ; // Test 1: How TZ affects system timezone console.log('1. TZ environment variable effect:'); const testCases = [ { tz: undefined, label: 'TZ unset' }, { tz: '', label: 'TZ empty' }, { tz: 'UTC', label: 'TZ=UTC' }, { tz: 'America/New_York', label: 'TZ=America/New_York' }, { tz: 'Invalid/Zone', label: 'TZ=Invalid/Zone' }, { tz: 'EST5EDT', label: 'TZ=EST5EDT' }, ]; testCases.forEach(({ tz, label }) => { if (tz === undefined) { delete process.env.TZ; } else { process.env.TZ = tz; } try { const systemTz = Intl.DateTimeFormat().resolvedOptions().timeZone; console.log(` ${label}: "${systemTz}"`); } catch (e) { console.log(` ${label}: ERROR - ${e.message}`); } }); // Restore original TZ if (originalTZ !== undefined) { process.env.TZ = originalTZ; } else { delete process.env.TZ; } // Test 2: Date object behavior with TZ console.log('\n2. Date object with different TZ values:'); testCases.slice(0, 4).forEach(({ tz, label }) => { if (tz === undefined) { delete process.env.TZ; } else { process.env.TZ = tz; } const date = new Date('2025-01-20T12:00:00Z'); console.log(` ${label}: ${date.toString()}`); }); // Restore if (originalTZ !== undefined) { process.env.TZ = originalTZ; } else { delete process.env.TZ; } // Test 3: Priority between TZ and DEFAULT_TIMEZONE console.log('\n3. Should we respect TZ over DEFAULT_TIMEZONE?'); console.log(' Common practice: TZ is the standard Unix way to set timezone'); console.log(' Recommendation: Check TZ before using DEFAULT_TIMEZONE'); console.log('\n=== Updated Precedence Logic ==='); console.log('1. Parameter (if provided and not empty string)'); console.log('2. DEFAULT_TIMEZONE env var (if valid)'); console.log('3. TZ env var (if it affects Intl.DateTimeFormat)'); console.log('4. System timezone (Intl.DateTimeFormat)'); console.log('5. UTC (final fallback)');