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seconds = 'seconds',
minutes = 'minutes',
hours = 'hours',
date = 'date',
month = 'month',
year = 'year',
}
const twoDigitTemplate = {
month: '2-digit',
day: '2-digit',
year: 'numeric',
hour: '2-digit',
minute: '2-digit',
second: '2-digit',
hour12: true,
}
const twoDigitTwentyFourTemplate = {
hour: '2-digit',
hour12: false
}
export interface DateTimeFormatOptions extends Intl.DateTimeFormatOptions {
timeStyle?: 'short' | 'medium' | 'long';
dateStyle?: 'short' | 'medium' | 'long' | 'full';
numberingSystem?: string;
}
export const getFormatByUnit = (unit: Unit): object => {
switch (unit) {
case 'date':
return { dateStyle: 'short' };
case 'month':
return {
month: 'numeric',
year: 'numeric'
};
case 'year':
return { year: 'numeric' };
}
};
/**
* For the most part this object behaves exactly the same way
* as the native Date object with a little extra spice.
*/
export class DateTime extends Date {
/**
* Used with Intl.DateTimeFormat
*/
locale = 'default';
/**
* Chainable way to set the {@link locale}
* @param value
*/
setLocale(value: string): this {
this.locale = value;
return this;
}
/**
* Converts a plain JS date object to a DateTime object.
* Doing this allows access to format, etc.
* @param date
* @param locale
*/
static convert(date: Date, locale: string = 'default'): DateTime {
if (!date) throw new Error(`A date is required`);
return new DateTime(
date.getFullYear(),
date.getMonth(),
date.getDate(),
date.getHours(),
date.getMinutes(),
date.getSeconds(),
date.getMilliseconds()
).setLocale(locale);
}
/**
* Attempts to create a DateTime from a string. A customDateFormat is required for non US dates.
* @param input
* @param localization
*/
static fromString(input: string, localization: any): DateTime {
return new DateTime(input);
}
/**
* Native date manipulations are not pure functions. This function creates a duplicate of the DateTime object.
*/
get clone() {
return new DateTime(
this.year,
this.month,
this.date,
this.hours,
this.minutes,
this.seconds,
this.getMilliseconds()
).setLocale(this.locale);
}
/**
* Sets the current date to the start of the {@link unit} provided
* Example: Consider a date of "April 30, 2021, 11:45:32.984 AM" => new DateTime(2021, 3, 30, 11, 45, 32, 984).startOf('month')
* would return April 1, 2021, 12:00:00.000 AM (midnight)
* @param unit
* @param startOfTheWeek Allows for the changing the start of the week.
*/
startOf(unit: Unit | 'weekDay', startOfTheWeek = 0): this {
if (this[unit] === undefined) throw new Error(`Unit '${unit}' is not valid`);
switch (unit) {
case 'seconds':
this.setMilliseconds(0);
break;
case 'minutes':
this.setSeconds(0, 0);
break;
case 'hours':
this.setMinutes(0, 0, 0);
break;
case 'date':
this.setHours(0, 0, 0, 0);
break;
case 'weekDay':
this.startOf(Unit.date);
if (this.weekDay === startOfTheWeek) break;
let goBack = this.weekDay;
if (startOfTheWeek !== 0 && this.weekDay === 0) goBack = 8 - startOfTheWeek;
this.manipulate(startOfTheWeek - goBack, Unit.date);
break;
case 'month':
this.startOf(Unit.date);
this.setDate(1);
break;
case 'year':
this.startOf(Unit.date);
this.setMonth(0, 1);
break;
}
return this;
}
/**
* Sets the current date to the end of the {@link unit} provided
* Example: Consider a date of "April 30, 2021, 11:45:32.984 AM" => new DateTime(2021, 3, 30, 11, 45, 32, 984).endOf('month')
* would return April 30, 2021, 11:59:59.999 PM
* @param unit
* @param startOfTheWeek
*/
endOf(unit: Unit | 'weekDay', startOfTheWeek = 0): this {
if (this[unit] === undefined) throw new Error(`Unit '${unit}' is not valid`);
switch (unit) {
case 'seconds':
this.setMilliseconds(999);
break;
case 'minutes':
this.setSeconds(59, 999);
break;
case 'hours':
this.setMinutes(59, 59, 999);
break;
case 'date':
this.setHours(23, 59, 59, 999);
break;
case 'weekDay':
this.endOf(Unit.date);
const endOfWeek = (6 + startOfTheWeek);
if (this.weekDay === endOfWeek) break;
this.manipulate(endOfWeek - this.weekDay, Unit.date);
break;
case 'month':
this.endOf(Unit.date);
this.manipulate(1, Unit.month);
this.setDate(0);
break;
case 'year':
this.endOf(Unit.date);
this.setMonth(11, 31);
break;
}
return this;
}
/**
* Change a {@link unit} value. Value can be positive or negative
* Example: Consider a date of "April 30, 2021, 11:45:32.984 AM" => new DateTime(2021, 3, 30, 11, 45, 32, 984).manipulate(1, 'month')
* would return May 30, 2021, 11:45:32.984 AM
* @param value A positive or negative number
* @param unit
*/
manipulate(value: number, unit: Unit): this {
if (this[unit] === undefined) throw new Error(`Unit '${unit}' is not valid`);
this[unit] += value;
return this;
}
/**
* Returns a string format.
* See https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Intl/DateTimeFormat
* for valid templates and locale objects
* @param template An object. Uses browser defaults otherwise.
* @param locale Can be a string or an array of strings. Uses browser defaults otherwise.
*/
format(template: DateTimeFormatOptions, locale = this.locale): string {
return new Intl.DateTimeFormat(locale, template).format(this);
}
/**
* Return true if {@link compare} is before this date
* @param compare The Date/DateTime to compare
* @param unit If provided, uses {@link startOf} for
* comparision.
*/
isBefore(compare: DateTime, unit?: Unit): boolean {
if (!unit) return this.valueOf() < compare.valueOf();
if (this[unit] === undefined) throw new Error(`Unit '${unit}' is not valid`);
return (
this.clone.startOf(unit).valueOf() < compare.clone.startOf(unit).valueOf()
);
}
/**
* Return true if {@link compare} is after this date
* @param compare The Date/DateTime to compare
* @param unit If provided, uses {@link startOf} for
* comparision.
*/
isAfter(compare: DateTime, unit?: Unit): boolean {
if (!unit) return this.valueOf() > compare.valueOf();
if (this[unit] === undefined) throw new Error(`Unit '${unit}' is not valid`);
return (
this.clone.startOf(unit).valueOf() > compare.clone.startOf(unit).valueOf()
);
}
/**
* Return true if {@link compare} is same this date
* @param compare The Date/DateTime to compare
* @param unit If provided, uses {@link startOf} for
* comparision.
*/
isSame(compare: DateTime, unit?: Unit): boolean {
if (!unit) return this.valueOf() === compare.valueOf();
if (this[unit] === undefined) throw new Error(`Unit '${unit}' is not valid`);
compare = DateTime.convert(compare);
return (
this.clone.startOf(unit).valueOf() === compare.startOf(unit).valueOf()
);
}
/**
* Check if this is between two other DateTimes, optionally looking at unit scale. The match is exclusive.
* @param left
* @param right
* @param unit.
* @param inclusivity. A [ indicates inclusion of a value. A ( indicates exclusion.
* If the inclusivity parameter is used, both indicators must be passed.
*/
isBetween(
left: DateTime,
right: DateTime,
unit?: Unit,
inclusivity: '()' | '[]' | '(]' | '[)' = '()'
): boolean {
if (unit && this[unit] === undefined) throw new Error(`Unit '${unit}' is not valid`);
const leftInclusivity = inclusivity[0] === '(';
const rightInclusivity = inclusivity[1] === ')';
return (leftInclusivity
? this.isAfter(left, unit)
: !this.isBefore(left, unit)) &&
(rightInclusivity
? this.isBefore(right, unit)
: !this.isAfter(right, unit)) ||
(leftInclusivity
? this.isBefore(left, unit)
: !this.isAfter(left, unit)) &&
(rightInclusivity
? this.isAfter(right, unit)
: !this.isBefore(right, unit));
}
/**
* Returns flattened object of the date. Does not include literals
* @param locale
* @param template
*/
parts(
locale = this.locale,
template: any = { dateStyle: 'full', timeStyle: 'long' }
): any {
const parts = {};
new Intl.DateTimeFormat(locale, template)
.formatToParts(this)
.filter((x) => x.type !== 'literal')
.forEach((x) => (parts[x.type] = x.value));
return parts;
}
/**
* Shortcut to Date.getSeconds()
*/
get seconds(): number {
return this.getSeconds();
}
/**
* Shortcut to Date.setSeconds()
*/
set seconds(value: number) {
this.setSeconds(value);
}
/**
* Returns two digit hours
*/
get secondsFormatted(): string {
return this.parts(undefined, twoDigitTemplate).second;
}
/**
* Shortcut to Date.getMinutes()
*/
get minutes(): number {
return this.getMinutes();
}
/**
* Shortcut to Date.setMinutes()
*/
set minutes(value: number) {
this.setMinutes(value);
}
/**
* Returns two digit minutes
*/
get minutesFormatted(): string {
return this.parts(undefined, twoDigitTemplate).minute;
}
/**
* Shortcut to Date.getHours()
*/
get hours(): number {
return this.getHours();
}
/**
* Shortcut to Date.setHours()
*/
set hours(value: number) {
this.setHours(value);
}
/**
* Returns two digit hours
*/
get hoursFormatted(): string {
return this.parts(undefined, twoDigitTwentyFourTemplate).hour;
}
/**
* Returns two digit hours but in twelve hour mode e.g. 13 -> 1
*/
get twelveHoursFormatted(): string {
return this.parts(undefined, twoDigitTemplate).hour;
}
/**
* Get the meridiem of the date. E.g. AM or PM.
* If the {@link locale} provides a "dayPeriod" then this will be returned,
* otherwise it will return AM or PM.
* @param locale
*/
meridiem(locale: string = this.locale): string {
return new Intl.DateTimeFormat(locale, {
hour: 'numeric',
hour12: true
} as any)
.formatToParts(this)
.find((p) => p.type === 'dayPeriod')?.value;
}
/**
* Shortcut to Date.getDate()
*/
get date(): number {
return this.getDate();
}
/**
* Shortcut to Date.setDate()
*/
set date(value: number) {
this.setDate(value);
}
/**
* Return two digit date
*/
get dateFormatted(): string {
return this.parts(undefined, twoDigitTemplate).day;
}
/**
* Shortcut to Date.getDay()
*/
get weekDay(): number {
return this.getDay();
}
/**
* Shortcut to Date.getMonth()
*/
get month(): number {
return this.getMonth();
}
/**
* Shortcut to Date.setMonth()
*/
set month(value: number) {
const targetMonth = new Date(this.year, value + 1);
targetMonth.setDate(0);
const endOfMonth = targetMonth.getDate();
if (this.date > endOfMonth) {
this.date = endOfMonth;
}
this.setMonth(value);
}
/**
* Return two digit, human expected month. E.g. January = 1, December = 12
*/
get monthFormatted(): string {
return this.parts(undefined, twoDigitTemplate).month;
}
/**
* Shortcut to Date.getFullYear()
*/
get year(): number {
return this.getFullYear();
}
/**
* Shortcut to Date.setFullYear()
*/
set year(value: number) {
this.setFullYear(value);
}
// borrowed a bunch of stuff from Luxon
/**
* Gets the week of the year
*/
get week(): number {
const ordinal = this.computeOrdinal(),
weekday = this.getUTCDay();
let weekNumber = Math.floor((ordinal - weekday + 10) / 7);
if (weekNumber < 1) {
weekNumber = this.weeksInWeekYear(this.year - 1);
} else if (weekNumber > this.weeksInWeekYear(this.year)) {
weekNumber = 1;
}
return weekNumber;
}
weeksInWeekYear(weekYear) {
const p1 =
(weekYear +
Math.floor(weekYear / 4) -
Math.floor(weekYear / 100) +
Math.floor(weekYear / 400)) %
7,
last = weekYear - 1,
p2 =
(last +
Math.floor(last / 4) -
Math.floor(last / 100) +
Math.floor(last / 400)) %
7;
return p1 === 4 || p2 === 3 ? 53 : 52;
}
get isLeapYear() {
return this.year % 4 === 0 && (this.year % 100 !== 0 || this.year % 400 === 0);
}
private computeOrdinal() {
return this.date + (this.isLeapYear ? this.leapLadder : this.nonLeapLadder)[this.month];
}
private nonLeapLadder = [0, 31, 59, 90, 120, 151, 181, 212, 243, 273, 304, 334];
private leapLadder = [0, 31, 60, 91, 121, 152, 182, 213, 244, 274, 305, 335];
}
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