# assertDateAfter

Source: https://smartassertions.dev/assertions/assertDateAfter/
Index of every page: https://smartassertions.dev/llms.txt

Assert that a Date holds a later instant than the expected one, with type-narrowing.

Comparing two instants through assertGreaterThan means reading epoch milliseconds out of the failure.

This reports both Dates in ISO form.

## Usage

```ts
import { assertDateAfter } from "@kensio/smartass";

const dueAt: unknown = new Date("2026-06-01T00:00:00.000Z");

assertDateAfter(dueAt, new Date("2026-01-01T00:00:00.000Z"));

// dueAt is now narrowed to Date
```

## Source

Source file: [`src/assert/date-after/date-after.assert.ts`](https://github.com/KensioSoftware/smartass/blob/main/src/assert/date-after/date-after.assert.ts)