snapshot of https://github.com/RocketChat/Rocket.Chat.git (develop, 2026-09-16; blobs > 131072B omitted)

apps/meteor/client/lib/utils/timestamp/conversion.ts

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+import { UTCOffsets, type TimestampFormat, type TimezoneKey } from './types';
+
+export const dateToISOString = (date: Date, timezone?: TimezoneKey): string => {
+	if (!date || isNaN(date.getTime())) {
+		return '';
+	}
+
+	if (timezone && timezone !== 'local') {
+		const offset = UTCOffsets[timezone];
+		if (offset) {
+			const year = date.getFullYear();
+			const month = String(date.getMonth() + 1).padStart(2, '0');
+			const day = String(date.getDate()).padStart(2, '0');
+			const hours = String(date.getHours()).padStart(2, '0');
+			const minutes = String(date.getMinutes()).padStart(2, '0');
+			const seconds = String(date.getSeconds()).padStart(2, '0');
+			const ms = String(date.getMilliseconds()).padStart(3, '0');
+			return `${year}-${month}-${day}T${hours}:${minutes}:${seconds}.${ms}${offset}`;
+		}
+	}
+
+	return date.toISOString().replace('Z', '+00:00');
+};
+
+/**
+ * Generates a timestamp markup string in the format <t:timestamp:format>
+ */
+export const generateTimestampMarkup = (timestamp: string, format: TimestampFormat): string => {
+	return `<t:${timestamp}:${format}>`;
+};

apps/meteor/client/lib/utils/timestamp/formats.ts

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+import type { TimestampFormat, ITimestampFormatConfig } from './types';
+
+export const TIMESTAMP_FORMATS: Record<TimestampFormat, ITimestampFormatConfig> = {
+	t: {
+		label: 'timestamps.shortTime',
+		format: 'p',
+		description: 'timestamps.shortTimeDescription',
+	},
+	T: {
+		label: 'timestamps.longTime',
+		format: 'pp',
+		description: 'timestamps.longTimeDescription',
+	},
+	d: {
+		label: 'timestamps.shortDate',
+		format: 'P',
+		description: 'timestamps.shortDateDescription',
+	},
+	D: {
+		label: 'timestamps.longDate',
+		format: 'Pp',
+		description: 'timestamps.longDateDescription',
+	},
+	f: {
+		label: 'timestamps.fullDateTime',
+		format: 'PPPP p',
+		description: 'timestamps.fullDateTimeDescription',
+	},
+	F: {
+		label: 'timestamps.fullDateTimeLong',
+		format: 'PPPP pp',
+		description: 'timestamps.fullDateTimeLongDescription',
+	},
+	R: {
+		label: 'timestamps.relativeTime',
+		format: 'relative',
+		description: 'timestamps.relativeTimeDescription',
+	},
+};

apps/meteor/client/lib/utils/timestamp/types.ts

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+export type TimestampFormat = 't' | 'T' | 'd' | 'D' | 'f' | 'F' | 'R';
+
+export interface ITimestampFormatConfig {
+	label: string;
+	format: string;
+	description: string;
+}
+
+export enum UTCOffsets {
+	'UTC-12' = '-12:00',
+	'UTC-11' = '-11:00',
+	'UTC-10' = '-10:00',
+	'UTC-9' = '-09:00',
+	'UTC-8' = '-08:00',
+	'UTC-7' = '-07:00',
+	'UTC-6' = '-06:00',
+	'UTC-5' = '-05:00',
+	'UTC-4' = '-04:00',
+	'UTC-3' = '-03:00',
+	'UTC-2' = '-02:00',
+	'UTC-1' = '-01:00',
+	'UTC' = '+00:00',
+	'UTC+1' = '+01:00',
+	'UTC+2' = '+02:00',
+	'UTC+3' = '+03:00',
+	'UTC+4' = '+04:00',
+	'UTC+5' = '+05:00',
+	'UTC+6' = '+06:00',
+	'UTC+7' = '+07:00',
+	'UTC+8' = '+08:00',
+	'UTC+9' = '+09:00',
+	'UTC+10' = '+10:00',
+	'UTC+11' = '+11:00',
+	'UTC+12' = '+12:00',
+}
+
+export type TimezoneKey = keyof typeof UTCOffsets | 'local';