Temporal API: JavaScript’s New Time Machine

Key Features

• Immutable Objects: All Temporal objects are immutable, preventing accidental modifications
• Better Timezone Handling: Built-in support for timezone operations
• ISO 8601 Compliance: Strict adherence to international standards
• Type Safety: Clear separation between different types of temporal data
• Human-Readable API: More intuitive method names and operations

Core Types

• Temporal.PlainDate: Represents a calendar date
• Temporal.PlainTime: Represents a wall-clock time
• Temporal.PlainDateTime: Combines date and time
• Temporal.Instant: Represents a point in time
• Temporal.ZonedDateTime: Date and time with timezone
• Temporal.Duration: Represents a length of time

Common Use Cases

• Date arithmetic without timezone headaches
• Formatting dates for different locales
• Calculating durations between dates
• Working with timezones in a predictable way
• Parsing and validating date strings

Polyfill Options

For browsers that don’t support Temporal yet, you can use:

• @js-temporal/polyfill
• temporal-polyfill

Example Usage

// Creating a date
const date = Temporal.PlainDate.from('2024-03-15');

// Adding days
const nextWeek = date.add({ days: 7 });

// Formatting
const formatted = date.toLocaleString('en-US', {
  year: 'numeric',
  month: 'long',
  day: 'numeric'
});

Best Practices

• Use Temporal for all new date/time operations
• Convert legacy Date objects to Temporal early in your code
• Leverage the built-in timezone support
• Use the appropriate Temporal type for your use case
• Take advantage of the immutable nature for safer code