The Temporal API provides modern date/time handling with proper timezone support, replacing the problematic Date object. Here's how to use it.
Core Concepts
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Creating Dates
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Timezones
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Arithmetic
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Comparing Dates
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Duration
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Formatting
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Calendar Support
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Practical Examples
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Time Zones Handling
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Migration from Date
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Best Practices
Choose the Right Type:
✓ Instant for timestamps
✓ ZonedDateTime for user-facing times
✓ PlainDateTime for local events
✓ PlainDate for dates without time
✓ Duration for time spans
Timezone Handling:
✓ Always store as UTC/Instant
✓ Convert to local for display
✓ Use named timezones, not offsets
✓ Handle DST transitions
Comparison:
✓ Use compare() for sorting
✓ Use equals() for equality
✓ Use until()/since() for differences
✓ Specify largestUnit for clarity
Avoid:
✗ Mixing Temporal and Date
✗ Storing local times as UTC
✗ Ignoring calendar systems
✗ Manual string formatting
Conclusion
The Temporal API provides comprehensive date/time handling with proper timezone support, duration arithmetic, and calendar systems. Use Instant for timestamps, ZonedDateTime for timezone-aware times, and Plain* types for calendar dates and times. The API handles DST transitions, leap years, and calendar conversions correctly, making it far superior to the legacy Date object for modern JavaScript applications.