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* Copyright (c) Siemens 2016 - 2025
* SPDX-License-Identifier: MIT
*/
import {
FormatWidth,
FormStyle,
getLocaleDateFormat,
getLocaleDateTimeFormat,
getLocaleDayPeriods,
getLocaleId,
getLocaleTimeFormat,
TranslationWidth
} from '@angular/common';
import { WeekStart } from './si-datepicker.model';
export interface DayOfWeek {
id: string;
index: number;
offset: number;
isWeekend: boolean;
}
const WEEK_ISO: DayOfWeek[] = [
{ id: 'monday', index: 1, offset: 0, isWeekend: false },
{ id: 'tuesday', index: 2, offset: 1, isWeekend: false },
{ id: 'wednesday', index: 3, offset: 2, isWeekend: false },
{ id: 'thursday', index: 4, offset: 3, isWeekend: false },
{ id: 'friday', index: 5, offset: 4, isWeekend: false },
{ id: 'saturday', index: 6, offset: 5, isWeekend: true },
{ id: 'sunday', index: 7, offset: 6, isWeekend: true }
];
export const WEEK_START_OFFSET = {
'monday': 0,
'saturday': 5,
'sunday': 6
};
const UNITS = {
millisecondsPerDay: 86400000,
daysPerWeek: 7,
thursday: 4
};
const dayOfWeekMap: {
[key: string]: DayOfWeek[];
} = {};
export const getDaysOfWeek = (weekStart: WeekStart): DayOfWeek[] => {
weekStart = weekStart ?? 'monday';
let weekdays: DayOfWeek[] = dayOfWeekMap[weekStart];
Iif (!weekdays) {
dayOfWeekMap[weekStart] = weekdays = [];
const offset = WEEK_START_OFFSET[weekStart];
for (let i = 0; i < 7; i++) {
weekdays.push({ ...WEEK_ISO[(i + offset) % 7], offset: i });
}
}
return weekdays;
};
/**
* Get local specific months using DateTimeFormat.
* @param locale - current locale
*/
export const getLocaleMonthNames = (locale: string): string[] => {
const format = new Intl.DateTimeFormat(locale, { month: 'long', timeZone: 'UTC' }).format;
return Array(12)
.fill(0)
.map((v, m) => format(new Date(Date.UTC(0, m))));
};
/**
* Get local specific weekdays as string using DateTimeFormat.
* @param locale - current local
* @param weekStart - start of the week
* @param format - display format
* @returns array of week days.
*/
export const getDayStrings = (
locale: string,
weekStart: WeekStart = 'monday',
format: 'narrow' | 'short' | 'long' = 'short'
): string[] => {
const dateFormatter = new Intl.DateTimeFormat(locale, { weekday: format, timeZone: 'utc' });
const days = [];
// Get local specific day strings from sunday (0) .. saturady (6)
for (let index = 1; index <= 7; index++) {
const day = new Date(Date.UTC(2023, 0, index));
days.push(dateFormatter.format(day));
}
const map = { 'sunday': 0, 'monday': 1, 'saturday': 6 };
const index = map[weekStart];
return days.slice(index).concat(days.slice(0, index));
};
/**
* Gets the first day in the specified month.
* Expects the month as a value between 1 and 12.
* The year is required to handle leap years.
*
* @returns The first day of the month as a Date.
*/
export const getFirstDayInMonth = (year: number, month: number): Date =>
new Date(year, month - 1, 1);
/**
* Gets the week number of the specified date.
* Week number according to the ISO-8601 standard, weeks starting on Monday.
* The first week of a year is the week that contains the first Thursday of the year (='First 4-day week').
* The highest week number in a year is either 52 or 53.
*
* @param date -The JavaScript date object.
* @param weekStart -Name of the first day of the week
* @returns The number of the Week
*/
export const getWeekOfYear = (date: Date, weekStart: WeekStart): number => {
// Algorithm rewritten from C# example given at http://en.wikipedia.org/wiki/Talk:ISO_week_date
const dayOfWeek = getWeekDayOffset(date, weekStart) + 1;
const nearestThu = new Date(date);
nearestThu.setDate(date.getDate() + (UNITS.thursday - dayOfWeek)); // get nearest Thursday (-3..+3 days)
const year = nearestThu.getFullYear();
const janfirst = getFirstDayInMonth(year, 1);
const days = Math.floor(((nearestThu as any) - (janfirst as any)) / UNITS.millisecondsPerDay);
const week = 1 + Math.floor(days / UNITS.daysPerWeek); // Count of Thursdays
return week;
};
export const getWeekDayOffset = (date: Date, weekStart: WeekStart): number => {
const offset = WEEK_START_OFFSET[weekStart ?? 'monday'];
return (date.getDay() + 6 - offset) % 7;
};
/** returns the date string in format YYYY-MM-DD for given date */
export const getStringforDate = (date: Date): string => {
let month = '' + (date.getMonth() + 1);
let day = '' + date.getDate();
const year = date.getFullYear();
Iif (month.length < 2) {
month = '0' + month;
}
Iif (day.length < 2) {
day = '0' + day;
}
return `${year}-${month}-${day}`;
};
/**
* Creates a new date object on from a date with or without time.
* @param value - The date from with the year, month and day is taken.
* @param hours - Optional numeric value of the hours, otherwise 0.
* @param minutes - Optional numeric value of the minutes, otherwise 0.
* @param seconds - Optional numeric value of the seconds, otherwise 0.
* @param milliseconds - Optional numeric value of the milliseconds, otherwise 0.
* @returns
*/
export const createDate = (
value: Date,
hours: number = 0,
minutes: number = 0,
seconds: number = 0,
milliseconds: number = 0
): Date => {
const newDate = new Date(
value.getFullYear(),
value.getMonth(),
value.getDate(),
hours,
minutes,
seconds,
milliseconds
);
// Seems redundant, but makes sure that increasing
// the hours does no change the date when switching
// from 11pm up.
newDate.setFullYear(value.getFullYear());
newDate.setMonth(value.getMonth());
newDate.setDate(value.getDate());
return newDate;
};
/** Creates a date but allows the month and date to overflow. */
const createDateInternal = (year: number, month: number, date: number): Date => {
const d = new Date();
d.setFullYear(year, month, date);
d.setHours(0, 0, 0, 0);
return d;
};
const NAMED_FORMATS: { [localeId: string]: { [format: string]: string } } = {};
const INVALID_DATE = new Date(NaN);
/**
* @param input - String containing a date or dateTime value (Ex. "05/15/2020"
* @param format - Format of the input value (Ex. "M/d/YYYY")
* @param locale - Locale of the input value
* @returns A JS Date in accordance of the three parameters
*/
export const parseDate = (input: string, format: string, locale: string): Date | undefined => {
if (!input) {
return undefined;
}
const splitFormat = format.split(/[^MydhHmsSa]+/);
const splitDate = input.toUpperCase().match(/\d+|\w+/g);
if (!splitDate) {
return INVALID_DATE;
}
// in case of some locales where meridian is with special chars
const dateAndMeridian = input.split(/ +/);
if (splitDate.length > 0 && dateAndMeridian.length > 0) {
const parsedMeridian = dateAndMeridian[dateAndMeridian.length - 1].toUpperCase();
Iif (
splitDate![splitDate.length - 1] !== parsedMeridian &&
getMeridian(parsedMeridian, locale)
) {
splitDate?.push(parsedMeridian);
}
}
let year = 0;
let month = 0;
/*
date as in the numeric day of the month to be provided for the Date() constructor.
default value is 1 since 0 refers to the last date of previous month.
*/
let date = 1;
let hour = 0;
let minute = 0;
let second = 0;
let milliseconds = 0;
// check if date is invalid and return if it is invalid
for (let i = 0; i < splitDate.length; i++) {
if (i === splitDate.length - 1) {
const parsedMeridian = splitDate![splitDate.length - 1];
// skip if its meridian
if (getMeridian(parsedMeridian, locale)) {
continue;
}
}
const parsedDateVal = parseInt(splitDate![i], 10);
if (isNaN(parsedDateVal)) {
return INVALID_DATE;
}
}
for (let i = 0; i < splitFormat.length; i++) {
const f = splitFormat[i];
let parsedNumber = parseInt(splitDate![i], 10);
if (f !== 'a' && isNaN(parsedNumber)) {
// auto fill seconds and milliseconds if not passed by user
Iif (f === 'ss' || f === 'SSS') {
parsedNumber = 0;
} else {
return INVALID_DATE;
}
}
if (f === 'M' || f === 'MM') {
month = parsedNumber;
} else if (f === 'd' || f === 'dd') {
date = parsedNumber;
} else if (f === 'y' || f === 'yy' || f === 'yyyy') {
// JS adds 1900 for numbers between 0 and 99. Adjust to be more user-friendly
year =
parsedNumber < 50
? parsedNumber + 2000
: parsedNumber < 100
? parsedNumber + 1900
: parsedNumber;
} else if (f === 'h' || f === 'HH') {
hour = parsedNumber;
} else if (f === 'mm') {
minute = parsedNumber;
} else if (f === 'ss') {
second = parsedNumber;
} else Iif (f === 'SSS') {
milliseconds = parsedNumber;
} else if (f === 'a') {
Iif (!isNaN(parseInt(splitDate![splitDate!.length - 1], 10))) {
continue;
}
const parsedMeridian = splitDate![splitDate.length - 1];
const meridian = getMeridian(parsedMeridian, locale);
Iif (hour === 12 && meridian === 'AM') {
hour = 0;
} else if (meridian === 'PM') {
hour = (hour % 12) + 12;
} else IEif (!meridian) {
return INVALID_DATE;
}
}
}
Iif (month > 12 || date > 31 || date > new Date(year, month, 0).getDate()) {
return INVALID_DATE;
}
return new Date(year, month - 1, date, hour, minute, second, milliseconds);
};
const getMeridian = (parsedMeridian: string, locale: string): 'AM' | 'PM' | undefined => {
const meridian = getLocaleDayPeriods(locale, FormStyle.Format, TranslationWidth.Short);
const usingAM = parsedMeridian === meridian[0].toUpperCase();
Iif (usingAM) {
return 'AM';
} else {
const usingPM = parsedMeridian === meridian[1].toUpperCase();
return usingPM ? 'PM' : undefined;
}
};
// Adapted from: https://github.com/angular/angular/blob/91954cf20e17a386d71cc8ea25d1d17b9ae1e31c/packages/common/src/i18n/format_date.ts
// unfortunately it is not exported there
export const getNamedFormat = (locale: string, format: string): string => {
const localeId = getLocaleId(locale);
NAMED_FORMATS[localeId] = NAMED_FORMATS[localeId] || {};
if (NAMED_FORMATS[localeId][format]) {
return NAMED_FORMATS[localeId][format];
}
let formatValue = '';
switch (format) {
case 'shortDate':
formatValue = getLocaleDateFormat(locale, FormatWidth.Short);
break;
case 'shortTime':
formatValue = getLocaleTimeFormat(locale, FormatWidth.Short);
break;
case 'mediumTime':
formatValue = getLocaleTimeFormat(locale, FormatWidth.Medium);
break;
case 'longTime':
formatValue = getLocaleTimeFormat(locale, FormatWidth.Long);
break;
case 'fullTime':
formatValue = getLocaleTimeFormat(locale, FormatWidth.Full);
break;
case 'short':
case 'medium':
{
const shortTime = getNamedFormat(locale, format === 'short' ? 'shortTime' : 'mediumTime');
const shortDate = getNamedFormat(locale, 'shortDate');
formatValue = formatDateTime(getLocaleDateTimeFormat(locale, FormatWidth.Short), [
shortTime,
shortDate
]);
}
break;
}
if (formatValue) {
NAMED_FORMATS[localeId][format] = formatValue;
}
return formatValue;
};
const formatDateTime = (str: string, optVals: string[]): string => {
if (optVals) {
str = str.replace(/\{([^}]+)}/g, (match, key) =>
optVals != null && key in optVals ? optVals[key] : match
);
}
return str;
};
export const getDateWithoutTime = (date: Date): Date => createDate(date, 0, 0, 0, 0);
/**
* Get today
* @returns date of today
*/
export const today = (): Date => new Date();
/**
* Calculate a new date based on the offset while considering the min and max date.
* @param current - input date.
* @param daysOffset - numeric offset of days.
* @returns new date if the range is valid or original date
*/
export const addDaysInRange = (
current: Date,
daysOffset: number,
minDate?: Date,
maxDate?: Date
): Date => {
const newDate = addDays(current, daysOffset);
// Make sure the new date is within the specified limits
// MinDate < new data < MaxDate
if (isSameOrBetween(newDate, minDate, maxDate)) {
return newDate;
}
return getDateSameOrBetween(newDate, minDate, maxDate);
};
/**
* Get date delta based on the offset.
* @param date - source date object.
* @param days - numeric offset of days.
* @returns new date.
*/
export const addDays = (date: Date, days: number): Date => {
const d = createDate(date);
d.setDate(d.getDate() + days);
return d;
};
/**
* Update date/day of give date without changing the month.
* In case the day exceed the number of days in the current month the last day in month will be assigned.
* @param date - the date object to update the day.
* @param day - the day which shall be set.
* @returns the updated date object.
*/
export const changeDay = (date: Date, day: number): Date => {
const lastDay = daysInMonth(date.getMonth(), date.getFullYear());
date.setDate(lastDay <= day ? lastDay : day);
return date;
};
/**
* Get date delta specifically for months based on the offset.
* @param current - starting date.
* @param monthsOffset - numeric offset of months.
* @param minDate - optional minimum allowed date.
* @param maxDate - optional maximum allowed date.
* @returns a new date object with the updated month.
*/
export const addMonthsInRange = (
current: Date,
monthsOffset: number,
minDate?: Date,
maxDate?: Date
): Date => {
let newDate = createDateInternal(current.getFullYear(), current.getMonth() + monthsOffset, 1);
newDate = changeDay(newDate, current.getDate());
if (isSameOrBetween(newDate, minDate, maxDate)) {
return newDate;
}
return getDateSameOrBetween(newDate, minDate, maxDate);
};
/**
* Get date delta specifically for years based on the offset.
* @param current - starting date.
* @param yearsOffset - numeric offset of years.
* @param minDate - optional minimum allowed date.
* @param maxDate - optional maximum allowed date.
* @returns a new date object with the updated year.
*/
export const addYearsInRange = (
current: Date,
yearsOffset: number,
minDate?: Date,
maxDate?: Date
): Date => {
const newDate = createDateInternal(
current.getFullYear() + yearsOffset,
current.getMonth(),
current.getDate()
);
if (isSameOrBetween(newDate, minDate, maxDate)) {
return newDate;
}
return getDateSameOrBetween(newDate, minDate, maxDate);
};
/**
* Get number of days for the given month and year.
* @param month - month as number (0..11).
* @param year - year as number.
* @returns the number of days for the given month.
*/
export const daysInMonth = (month: number, year: number): number =>
// By using 0 as the day it will give us the last day of the prior
// month. So passing in 1 as the month number will return the last day
new Date(year, month + 1, 0).getDate();
/**
* Get the first date of the week based on the input date.
* @param current - a date object from where the last date of a week is derived.
* @param weekStartDay - optional when a week shall start.
* @returns a new date object which is the start of the current week.
*/
export const getWeekStartDate = (current: Date, weekStartDay: WeekStart = 'monday'): Date => {
const weekStartDate = createDate(current);
const diff = current.getDate() - getWeekDayOffset(current, weekStartDay);
weekStartDate.setDate(diff);
return weekStartDate;
};
/**
* Get the last date of the week based on the input date.
* @param current - a date object from where the last date of a week is derived.
* @param weekStartDay - optional when a week shall start.
* @returns the last date within the week.
*/
export const getWeekEndDate = (current: Date, weekStartDay: WeekStart = 'monday'): Date => {
const weekStartDate = createDate(current);
weekStartDate.setDate(current.getDate() + 6 - getWeekDayOffset(current, weekStartDay));
return weekStartDate;
};
/**
* Get the beginning of the month.
* @param current - a date object from where the first date in a month is derived.
* @returns a new date object which starts a the first.
*/
export const getFirstDateInMonth = (current: Date): Date =>
new Date(current.getFullYear(), current.getMonth(), 1);
/**
* Get the last date of the month.
* @param current - a date object from where we derive the last date in a month.
* @returns a new date object which is the last day in the current month.
*/
export const getLastDateInMonth = (current: Date): Date =>
new Date(current.getFullYear(), current.getMonth() + 1, 0);
/**
* Get the beginning of the year.
* @param current - a date object from where the first date in a year is derived.
* @returns a new date object which starts a the first.
*/
export const getFirstDateInYear = (current: Date): Date => new Date(current.getFullYear(), 0, 1);
/**
* Are the two dates identical without considering time.
*/
export const isSameDate = (current: Date, compareTo?: Date): boolean => {
if (!compareTo) {
return false;
}
return (
current.getFullYear() === compareTo.getFullYear() &&
current.getMonth() === compareTo.getMonth() &&
current.getDate() === compareTo.getDate()
);
};
/**
* Are the two months identical without considering time.
*/
export const isSameMonth = (current: Date, compareTo?: Date): boolean => {
if (!compareTo) {
return false;
}
return isSameYear(current, compareTo) && current.getMonth() === compareTo.getMonth();
};
/**
* Are the two years identical.
*/
export const isSameYear = (current: Date, compareTo?: Date): boolean => {
Iif (!compareTo) {
return false;
}
return current.getFullYear() === compareTo.getFullYear();
};
/**
* Compares two dates.
* @param first - The first date to compare.
* @param second - The second date to compare.
* @returns 0 if the dates are equal, a number less than 0 if the first date is earlier,
* a number greater than 0 if the first date is later.
*/
export const compareDate = (first: Date, second: Date): number =>
compareMonth(first, second) || first.getDate() - second.getDate();
/**
* Compares two months.
* @param first - The first month to compare.
* @param second - The second month to compare.
* @returns 0 if the months are equal, a number less than 0 if the first month is earlier,
* a number greater than 0 if the first month is later.
*/
export const compareMonth = (first: Date, second: Date): number =>
compareYear(first, second) || first.getMonth() - second.getMonth();
/**
* Compares two years.
* @param first - The first year to compare.
* @param second - The second year to compare.
* @returns 0 if the years are equal, a number less than 0 if the first year is earlier,
* a number greater than 0 if the first year is later.
*/
export const compareYear = (first: Date, second: Date): number =>
first.getFullYear() - second.getFullYear();
/**
* Compare the current date is the same date or between start and end date.
* @param current - the date object.
* @param from - optional min date, if no value is provided we assume true for the min value.
* @param to - optional max date, if no value is provided we assume true for the max value.
* @returns true if the date is in the provided range.
*/
export const isSameOrBetween = (current: Date, from?: Date, to?: Date): boolean => {
// from <= d
const isInMinRange = from ? compareDate(from, current) <= 0 : true;
// d <= to
const isInMaxRange = to ? compareDate(current, to) <= 0 : true;
return isInMinRange && isInMaxRange;
};
/**
* Compare the current month is the same month or between start and end month.
* @param current - the month object.
* @param from - optional min month, if no value is provided we assume true for the min value.
* @param to - optional max month, if no value is provided we assume true for the max value.
* @returns true if the date is in the provided range.
*/
export const isSameOrBetweenMonth = (current: Date, from?: Date, to?: Date): boolean => {
// from <= d
const isInMinRange = from ? compareMonth(from, current) <= 0 : true;
// d <= to
const isInMaxRange = to ? compareMonth(current, to) <= 0 : true;
return isInMinRange && isInMaxRange;
};
/**
* Compare the current year is the same year or between start and end year.
* @param current - the year object.
* @param from - optional min year, if no value is provided we assume true for the min value.
* @param to - optional max year, if no value is provided we assume true for the max value.
* @returns true if the date is in the provided range.
*/
export const isSameOrBetweenYears = (current: Date, from?: Date, to?: Date): boolean => {
// from <= d
const isInMinRange = from ? compareYear(from, current) <= 0 : true;
// d <= to
const isInMaxRange = to ? compareYear(current, to) <= 0 : true;
return isInMinRange && isInMaxRange;
};
/**
* Compare the current date is between start and end date.
* from \< current \< to
*/
export const isBetween = (current: Date, from?: Date, to?: Date): boolean => {
const isInMinRange = from ? compareDate(current, from) > 0 : true;
const isInMaxRange = to ? compareDate(current, to) < 0 : true;
return isInMinRange && isInMaxRange;
};
/**
* Compare the current month is between start and end month.
* from \< current \< to
*/
export const isBetweenMonth = (current: Date, from?: Date, to?: Date): boolean => {
const isInMinRange = from ? compareMonth(current, from) > 0 : true;
const isInMaxRange = to ? compareMonth(current, to) < 0 : true;
return isInMinRange && isInMaxRange;
};
/**
* Compare the current year is between start and end year.
* from \< current \< to
*/
export const isBetweenYears = (current: Date, from?: Date, to?: Date): boolean => {
const isInMinRange = from ? compareYear(current, from) > 0 : true;
const isInMaxRange = to ? compareYear(current, to) < 0 : true;
return isInMinRange && isInMaxRange;
};
/**
* Is first date after the second date (without considering the time).
* current \> compareTo
*/
export const isAfter = (current: Date, compareTo: Date): boolean =>
compareDate(current, compareTo) > 0;
/**
* Is first month after the second month (without considering the time).
* current \> compareTo
*/
export const isAfterMonth = (current: Date, compareTo: Date): boolean =>
compareMonth(current, compareTo) > 0;
/**
* Is first year after the second year.
* current \> compareTo
*/
export const isAfterYear = (current: Date, compareTo: Date): boolean =>
compareYear(current, compareTo) > 0;
/**
* Is first date equal or before the second date (without considering the time).
* current \>= compareTo
*/
export const isSameOrBefore = (current: Date, compareTo: Date): boolean =>
compareDate(current, compareTo) <= 0;
/**
* Is first month equal or before the second month.
* current \>= compareTo
*/
export const isSameOrBeforeMonth = (current: Date, compareTo: Date): boolean =>
compareMonth(current, compareTo) <= 0;
/**
* Is first year equal or before the second year.
* current \>= compareTo
*/
export const isSameOrBeforeYear = (current: Date, compareTo: Date): boolean =>
compareMonth(current, compareTo) <= 0;
/**
* Are the two dates in different months.
*/
export const isAnotherMonth = (current: Date, compareTo: Date): boolean =>
current.getMonth() !== compareTo.getMonth();
/**
* Are the two dates in different years.
*/
export const isAnotherYear = (current: Date, compareTo: Date): boolean =>
current.getFullYear() !== compareTo.getFullYear();
/**
* Are the two dates either in different months or years.
*/
export const isAnotherMonthOrYear = (current: Date, compareTo: Date): boolean =>
isAnotherMonth(current, compareTo) || isAnotherYear(current, compareTo);
/**
* Get a date which is in within the range and the close to current.
*/
export const getDateSameOrBetween = (current: Date, minDate?: Date, maxDate?: Date): Date => {
if (isSameOrBetween(current, minDate, maxDate)) {
return current;
}
const minDistance = minDate
? Math.ceil(Math.abs(current.getTime() - minDate!.getTime()))
: Number.MAX_VALUE;
const maxDistance = maxDate
? Math.ceil(Math.abs(current.getTime() - maxDate!.getTime()))
: Number.MAX_VALUE;
return minDistance < maxDistance ? createDate(minDate!) : createDate(maxDate!);
};
/**
* Get date or absolute min date.
* @param date - input date.
* @returns date or date of 1.1.1900
*/
export const getMinDate = (date?: Date): Date =>
date && !isNaN(date.getTime()) ? date : new Date(Date.UTC(1900, 0, 1));
/**
* Get date or absolute max date.
* @param date - input date.
* @returns date or date of 31.12.2154
*/
export const getMaxDate = (date?: Date): Date =>
date && !isNaN(date.getTime()) ? date : new Date(Date.UTC(2154, 11, 31));
/**
* Is valid date object.
*/
export const isValid = (date?: Date): date is NonNullable<Date> => !!date && !isNaN(date.getTime());
/**
* Returns the next months of the given date.
* @param date - The date for which the next month is returned.
* @returns A date of the first day of the following month of the given day.
*/
export const nextMonth = (date: Date): Date => {
Iif (date.getMonth() === 11) {
return new Date(date.getFullYear() + 1, 0, 1);
} else {
return new Date(date.getFullYear(), date.getMonth() + 1, 1);
}
};
/**
* Returns the last day of the previous month of the given date object.
* @param date - The date for which the previous month is returned.
* @returns A date of the last day of the previous month of the given day.
*/
export const previousMonth = (date: Date): Date => {
Iif (date.getMonth() === 0) {
return new Date(date.getFullYear() - 1, 12, 0);
} else {
return new Date(date.getFullYear(), date.getMonth(), 0);
}
};
export const minDate = (first?: Date, second?: Date): Date | undefined => {
return !!first && !!second ? (first < second ? first : second) : (first ?? second);
};
export const maxDate = (first?: Date, second?: Date): Date | undefined => {
return !!first && !!second ? (first > second ? first : second) : (first ?? second);
};
|