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import { Timestamp } from "google-protobuf/google/protobuf/timestamp_pb";
import { TFunction } from "i18next";
import { Temporal } from "temporal-polyfill";
// Creating Intl.Segmenter every time is slow, so cache one per locale.
const segmenterCache = new Map<string, Intl.Segmenter>();
/// Uppercases the first grapheme cluster of a string, leaving the rest untouched.
/// Non-capitalizable first clusters (digits, CJK, etc.) are returned unchanged.
/// Only for dates that stand alone (their own "sentence") — never for dates
/// interpolated into a larger translated string.
function capitalizeFirstLetter(value: string, locale: string): string {
let segmenter = segmenterCache.get(locale);
if (!segmenter) {
segmenter = new Intl.Segmenter(locale, { granularity: "grapheme" });
segmenterCache.set(locale, segmenter);
}
const first = segmenter.segment(value)[Symbol.iterator]().next()
.value?.segment;
Iif (!first) return value;
return first.toLocaleUpperCase(locale) + value.slice(first.length);
}
const dayMillis = Temporal.Duration.from({ hours: 24 }).total("milliseconds");
const numNights = (date1: string, date2: string) => {
const diffTime = Date.parse(date1) - Date.parse(date2);
const diffDays = Math.ceil(diffTime / dayMillis);
return diffDays;
};
/// Converts a Temporal.PlainDate[Time] to a Date, interpreting it in UTC timezone.
function toUTCDate(
temporal: Temporal.PlainDate | Temporal.PlainDateTime,
): Date {
if (temporal instanceof Temporal.PlainDate) {
temporal = temporal.toPlainDateTime();
}
const zoned = temporal.toZonedDateTime("Etc/UTC");
return new Date(zoned.epochMilliseconds);
}
export const UTC_TIMEZONE: string = "Etc/UTC";
interface LocalizeDateTimeParams {
/// The locale to localize in.
locale: string;
/// Whether to include the date (defaults to true).
includeDate?: boolean;
/// If including the date, whether to include the day (defaults to true).
includeDay?: boolean;
/// If including the date, whether to include the day of week (defaults to false).
includeDayOfWeek?: boolean;
/// Whether to include the time (defaults to true).
includeTime?: boolean;
/// If including the time, whether to include seconds (defaults to false).
includeSeconds?: boolean;
/// Whether to abbreviate days of the week and month names (defaults to false).
abbreviate?: boolean;
/// Whether to uppercase the first letter (defaults to false). Set this only when
/// the date stands alone (not interpolated into a larger sentence) so it reads
/// like the start of a sentence. Day/month names are never otherwise capitalized.
capitalize?: boolean;
}
/// Localizes a date and time, optionally with the day of the week.
export function localizeDateTime(
date: Temporal.PlainDateTime,
args: LocalizeDateTimeParams,
): string {
const format = getIntlDateTimeFormatUTC(args);
const formatted = format.format(toUTCDate(date));
return args.capitalize
? capitalizeFirstLetter(formatted, args.locale)
: formatted;
}
/// Localizes only the year and month of a date.
export function localizeYearMonth(
date: Temporal.PlainDate,
args: {
locale: string;
abbreviate?: boolean;
capitalize?: boolean;
},
): string {
return localizeDateTime(date.toPlainDateTime(), {
locale: args.locale,
abbreviate: args.abbreviate,
capitalize: args.capitalize,
includeDay: false,
includeTime: false,
});
}
/// Localizes a range of date and times as a string.
export function localizeDateTimeRange(
start: Temporal.PlainDateTime,
end: Temporal.PlainDateTime,
args: LocalizeDateTimeParams,
): string {
const format = getIntlDateTimeFormatUTC(args);
const formatted = format.formatRange(toUTCDate(start), toUTCDate(end));
return args.capitalize
? capitalizeFirstLetter(formatted, args.locale)
: formatted;
}
// Creating Intl.DateTimeFormat every time is 40x slower.
const intlDateTimeFormatCache = new Map<string, Intl.DateTimeFormat>();
/// Gets an Intl.DateTimeFormat based on params.
function getIntlDateTimeFormatUTC(
args: LocalizeDateTimeParams,
): Intl.DateTimeFormat {
// We can't use args as the Map key as it uses reference equality.
// Convert it to a json string. The Symbol type requires special handling.
const cacheKey = JSON.stringify(args, (_, v) =>
typeof v === "symbol" ? v.toString() : v,
);
const cached = intlDateTimeFormatCache.get(cacheKey);
if (cached) return cached;
const format = createIntlDateTimeFormatUTC(args);
intlDateTimeFormatCache.set(cacheKey, format);
return format;
}
/// Creates a new Intl.DateTimeFormat object based on params.
function createIntlDateTimeFormatUTC(
args: LocalizeDateTimeParams,
): Intl.DateTimeFormat {
const options: Intl.DateTimeFormatOptions = {};
if (args.includeDate !== false) {
options.year = "numeric";
options.month = args.abbreviate ? "short" : "long";
if (args.includeDay !== false) {
options.day = "numeric";
}
if (args.includeDayOfWeek) {
options.weekday = args.abbreviate ? "short" : "long";
}
}
if (args.includeTime !== false) {
options.hour = "numeric";
options.minute = "numeric";
if (args.includeSeconds) {
options.second = "numeric";
}
}
options.timeZone = "Etc/UTC";
return Intl.DateTimeFormat(args.locale, options);
}
/// Localizes just the abbreviated month name of a date (e.g. "Jan", "Mai" in German).
export function localizeMonthAbbreviation(
date: Temporal.PlainDate,
args: {
locale: string;
capitalize?: boolean;
},
): string {
const cacheKey = JSON.stringify(args, (_, v) =>
typeof v === "symbol" ? v.toString() : v,
);
let format = intlDateTimeFormatCache.get(cacheKey);
if (!format) {
const options: Intl.DateTimeFormatOptions = { month: "short" };
options.timeZone = "Etc/UTC";
format = Intl.DateTimeFormat(args.locale, options);
intlDateTimeFormatCache.set(cacheKey, format);
}
const formatted = format.format(toUTCDate(date));
return args.capitalize
? capitalizeFirstLetter(formatted, args.locale)
: formatted;
}
const isoMuiDateFormat = "YYYY-MM-DD";
/// Gets the date format for a locale using Material UI placeholders.
export function getMuiDateFormat(locale: string): string {
if (Intl.DateTimeFormat.supportedLocalesOf(locale).length === 0) {
return isoMuiDateFormat;
}
// Format dummy 3333-11-22 date to figure out how it gets laid out.
const referenceDate = new Intl.DateTimeFormat(locale, {
day: "numeric",
month: "numeric",
year: "numeric",
}).format(new Date(3333, 10, 22));
const format = referenceDate
.replace("3333", "YYYY")
.replace("33", "YY")
.replace("11", "MM")
.replace("22", "DD");
// Sanity check: There should be no digits left
Iif (/[0-9]/.test(format)) return isoMuiDateFormat;
return format;
}
const defaultMuiTimeFormat = "HH:mm";
/// Gets a localized time format string compatible with Material UI time pickers.
export function getMuiTimeFormat(locale: string): string {
if (Intl.DateTimeFormat.supportedLocalesOf(locale).length === 0) {
return defaultMuiTimeFormat;
}
const intlFormat = new Intl.DateTimeFormat(locale, {
hour: "numeric",
minute: "numeric",
hour12: undefined,
});
// Sniff the format using example dates.
// Assume formats only vary by hour-minute separator, 12h vs 24h, and leading zeroes.
const hourMinuteSeparatorMatch = /10(\W+)10/.exec(
intlFormat.format(new Date(1970, 0, 1, 10, 10)),
);
const hourMinuteSeparator = hourMinuteSeparatorMatch
? hourMinuteSeparatorMatch[1]
: ":";
const uses24h = intlFormat.format(new Date(1970, 0, 1, 23, 0)).includes("23");
const usesLeadingZeroes = intlFormat
.format(new Date(1970, 0, 1, 3, 0))
.includes("03");
let format = "";
if (uses24h) {
format += usesLeadingZeroes ? "HH" : "H";
} else {
format += usesLeadingZeroes ? "hh" : "h";
}
format += hourMinuteSeparator;
format += "mm";
if (!uses24h) {
format += " a";
}
return format;
}
/// Converts a protobuf Timestamp to a Temporal.Instant value (timezone-agnostic).
export function timestampToInstant(
timestamp: Timestamp.AsObject,
): Temporal.Instant {
// By protobuf, seconds and nanos should be integers.
// Just in case, drop decimals otherwise BigInt will blow up.
const nanos =
BigInt(Math.floor(timestamp.nanos)) +
BigInt(Math.floor(timestamp.seconds)) * 1_000_000_000n;
return new Temporal.Instant(nanos);
}
/// Converts a Temporal Instant to a PlainDateTime in the browser's timezone.
export function instantToPlainDateTime(
instant: Temporal.Instant,
timezone?: string,
): Temporal.PlainDateTime {
return instant
.toZonedDateTimeISO(timezone ?? Temporal.Now.timeZoneId())
.toPlainDateTime();
}
/// Converts a protobuf Timestamp to a PlainDateTime in the browser's timezone.
export function timestampToPlainDateTime(
timestamp: Timestamp.AsObject,
timezone?: string,
): Temporal.PlainDateTime {
return instantToPlainDateTime(timestampToInstant(timestamp), timezone);
}
export interface LocalizeRelativeTimeOptions {
style?: Intl.RelativeTimeFormatStyle;
/// We override the default to "auto"
numeric?: Intl.RelativeTimeFormatNumeric;
/// If true, capitalize if the script supports it. By default uses running text capitalization.
capitalize?: boolean;
}
// Creating Intl objects every time is slow, so cache them.
const relativeTimeFormatCache = new Map<string, Intl.RelativeTimeFormat>();
export function localizeRelativeTimeUnit(
value: number,
unit: Intl.RelativeTimeFormatUnit,
locale: string,
options?: LocalizeRelativeTimeOptions,
): string {
const intlOptions = {
style: options?.style ?? "long",
numeric: options?.numeric ?? "auto",
};
const cacheKey = JSON.stringify({ locale, ...intlOptions });
let formatter = relativeTimeFormatCache.get(cacheKey);
if (!formatter) {
formatter = new Intl.RelativeTimeFormat(locale, intlOptions);
relativeTimeFormatCache.set(cacheKey, formatter);
}
let result = formatter.format(value, unit);
if (options?.capitalize === true)
result = capitalizeFirstLetter(result, locale);
return result;
}
/// Localizes a duration (positive or negative)'s largest unit (e.g. "4 days" ignoring minutes).
export function localizeDurationLargestUnit(
delta: Temporal.Duration,
locale: string,
options?: LocalizeRelativeTimeOptions & {
smallestUnit?: Temporal.PluralizeUnit<Temporal.TimeUnit>;
t?: TFunction<"global", undefined>;
},
) {
if (delta.years != 0)
return localizeRelativeTimeUnit(delta.years, "years", locale, options);
if (delta.months != 0)
return localizeRelativeTimeUnit(delta.months, "months", locale, options);
if (delta.weeks != 0)
return localizeRelativeTimeUnit(delta.weeks, "weeks", locale, options);
if (delta.days != 0)
return localizeRelativeTimeUnit(delta.days, "days", locale, options);
// Support "less than one hour ago"
if (
delta.hours != 0 ||
options?.smallestUnit == "hour" ||
options?.smallestUnit == "hours"
) {
Iif (delta.hours == 0 && delta.sign <= 0 && options?.t)
return options.t("global:relative_time.less_than_one_hour_ago");
return localizeRelativeTimeUnit(delta.hours, "hours", locale, options);
}
// Support "less than one minute ago"
if (
delta.minutes != 0 ||
options?.smallestUnit == "minute" ||
options?.smallestUnit == "minutes"
) {
if (delta.minutes == 0 && delta.sign <= 0 && options?.t)
return options.t("global:relative_time.less_than_a_minute_ago");
return localizeRelativeTimeUnit(delta.minutes, "minutes", locale, options);
}
return localizeRelativeTimeUnit(delta.seconds, "seconds", locale, options);
}
/// Localizes a point in time as a duration relative to some other point in time (by default, now).
export function localizeRelativeTime(
instant: Temporal.Instant | Timestamp.AsObject,
locale: string,
options?: LocalizeRelativeTimeOptions & {
relativeTo?: Temporal.Instant;
smallestUnit?: Temporal.PluralizeUnit<Temporal.TimeUnit>;
t?: TFunction<"global", undefined>;
},
) {
if (!(instant instanceof Temporal.Instant)) {
instant = timestampToInstant(instant);
}
let duration = instant.since(options?.relativeTo ?? Temporal.Now.instant(), {
largestUnit: "hours", // Only supports time units, no date units.
});
// Approximate date units above 24 hours.
if (duration.hours >= 24 || duration.hours <= -24) {
// Manipulate the absolute value for modulo operations
const isPositive = duration.sign >= 0;
duration = duration.abs();
duration = duration.with({
days: Math.floor(duration.hours / 24),
hours: duration.hours % 24,
});
if (duration.days >= 365) {
duration = duration.with({
years: Math.floor(duration.days / 365),
days: duration.days % 365,
});
} else if (duration.days >= 30) {
duration = duration.with({
months: Math.floor(duration.days / 30),
days: duration.days % 30,
});
} else if (duration.days >= 7) {
duration = duration.with({
weeks: Math.floor(duration.days / 7),
days: duration.days % 7,
});
}
if (!isPositive) duration = duration.negated();
}
return localizeDurationLargestUnit(duration, locale, options);
}
export { numNights };
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