Temporal API in TypeScript: Handling Deadlines and Time Zones Correctly

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A developer explains how the new Temporal API in TypeScript, available without a flag in Node.js 26, replaces the legacy Date object with dedicated types for instants, calendar dates and zoned times. The article notes that Date-based deadline logic often breaks around daylight saving time changes, such as when "plus 48 hours" yields a different result than "plus two days." It walks through building deadline logic for a fictional library, storing values in DynamoDB and deploying to AWS Lambda with the Serverless Framework. The piece also covers testing across DST transitions and migrating from Date or date-fns. Temporal is described as immutable and organized as a namespace containing several classes, each suited to different use cases.

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