toRFC2822

Converts a date to RFC 2822 format Format: Day, DD Mon YYYY HH:mm:ss +0000 Used in email headers (Date field) and HTTP headers

Available since v2.0.0

Import

import { toRFC2822 } from '@helpers4/date';

Signature

toRFC2822(date: DateLike): string | null

Parameters

Parameter	Type	Description
date	DateLike	Date to convert (Date object, timestamp, or date string)

Returns

string | null — RFC 2822 formatted string or null if invalid date

Examples

toRFC2822

toRFC2822(new Date('2025-01-19T12:30:00Z')) // 'Sun, 19 Jan 2025 12:30:00 +0000'

Related Types

DateLike

A value that can be converted to a Date.

• Date — used as-is (validated for Invalid Date)
• number — treated as a timestamp (seconds or milliseconds, auto-detected); 0 is treated as invalid and produces null in ensureDate
• string — parsed via new Date(string)
• EpochMilliseconds — any object with a epochMilliseconds property (e.g. Temporal.Instant, Temporal.ZonedDateTime)

// TODO: When the Temporal API reaches Stage 4 and is available without // flags in all major runtimes, consider narrowing the union to the // concrete Temporal types for stricter type-checking.

type DateLike = Date | number | string | EpochMilliseconds

EpochMilliseconds

An object that exposes an epoch timestamp in milliseconds.

This structural type is satisfied by Temporal.Instant and Temporal.ZonedDateTime (and any future object that carries the same property), so callers can pass Temporal values without importing them.

interface EpochMilliseconds {
  epochMilliseconds: number;
}

Source

View source on GitHub