@cute-dw/core
Version:
This TypeScript library is the main part of a more powerfull package designed for the fast WEB software development. The cornerstone of the library is the **DataStore** class, which might be useful when you need a full control of the data, but do not need
400 lines (399 loc) • 49.5 kB
JavaScript
/**
* This class consists exclusively of the static methods that operate on or return date/time values
*/
export class Dates {
/**
* Gets the current date and time
* @returns Current date/time value
*/
static getDate() {
return new Date();
}
/**
* Calculates the number of days in the month
* @param date Base date
* @returns Count of days
*/
static daysInMonth(date) {
if (date == null)
return NaN;
const yy = date.getFullYear();
const mm = date.getMonth();
return Dates.toDays(Date.UTC(yy, mm + 1, 1) - Date.UTC(yy, mm, 1));
}
/**
* Calculates the number of days in the `quarter`
* @param year The number of the year.
* @param quarter The number of the quarter.
* @returns Count of days
*/
static daysInQuarter(year, quarter) {
const today = Dates.getDate();
year = year ?? today.getFullYear();
quarter = quarter ?? Dates.getQuarter(today);
return Dates.toDays(Date.UTC(year, (quarter + 1) * 3, 1) - Date.UTC(year, (quarter * 3), 1));
}
/**
* Calculates the number of days in the `year`
* @param year The number of the year. Default is the current year.
* @returns Count of days
*/
static daysInYear(year) {
year = year ?? new Date(Date.now()).getFullYear();
return (Dates.toDays(Date.UTC(year + 1, 0, 1) - Date.UTC(year, 0, 1)));
}
/**
* Calculates the date of the first week's day in the month
* @param day Day of the week in range 0 Sunday to 6 Saturday
* @param month Month
* @param year Year
* @returns Date
*/
static firstDayInMonth(day, month, year) {
// day is in range 0 Sunday to 6 Saturday
const today = Dates.getDate();
year = year ?? today.getFullYear();
month = month ?? today.getMonth();
return new Date(year, month, 1 +
(day - new Date(year, month, 1).getDay() + 7) % 7);
}
/**
* Calculates the date of n-th week's day in the month
* @param n Ordered number
* @param day Day of week in range 0 Sunday to 6 Saturday
* @param month Month
* @param year Year
* @returns Date
*/
static nthDayInMonth(n, day, month, year) {
// day is in range 0 Sunday to 6 Saturday
const today = Dates.getDate();
year = year ?? today.getFullYear();
month = month ?? today.getMonth();
const d = Dates.firstDayInMonth(day, month, year);
return new Date(d.getFullYear(), d.getMonth(), d.getDate() + (n - 1) * 7);
}
/**
* Calculates the number of days to fixed `day` number
* @param day The day number in the current month
* @returns Number of days
*/
static daysFromFixedDay(day) {
const today = Dates.getDate();
const y = today.getFullYear();
const m = today.getMonth();
const d2 = today.getDate();
const dInPrevMonth = Dates.daysInMonth(new Date(y, m - 1, 1));
return (Dates.toDays(Date.UTC(y, m, d2) - Date.UTC(y, m, day)) + dInPrevMonth) % dInPrevMonth;
}
/**
* Determines the number of days one date occurs after another.
* @param date1 A date value that is the start date of the interval being measured
* @param date2 A date value that is the end date of the interval
* @returns {number} Returns a number of days date2 occurs after date1. If date2 occurs before date1, DaysAfter returns a negative number. If any argument's value is null, DaysAfter returns null.
*/
static daysAfter(date1, date2) {
if (date1 == null || date2 == null)
return null;
//var diff = new Date(+date2).setHours(12) - new Date(+date1).setHours(12);
//return Math.round(diff / Dates.msPerDay);
return Dates.toDays(Dates.toUTC(date2) - Dates.toUTC(date1));
}
/**
* Determines the number of seconds one date occurs after another.
* @param date1 A date value that is the start date of the interval being measured
* @param date2 A date value that is the end date of the interval
* @returns {number} Returns a number of seconds date2 occurs after date1. If date2 occurs before date1, DaysAfter returns a negative number. If any argument's value is null, DaysAfter returns null.
*/
static secondsAfter(date1, date2) {
if (date1 == null || date2 == null)
return null;
// var diff = new Date(+date2).getTime() - new Date(+date1).getTime();
const diff = Dates.toUTC(date2) - Dates.toUTC(date1);
return Math.round(diff / 1000);
}
/**
* Obtains the date that occurs a specified number of days after or before another date
* @param date A value of type date
* @param days An integer indicating a number of days
* @returns The date that occurs `days` after date if `days` is greater than 0. Returns the date that occurs `days` before date if `days` is less than 0. If any argument's value is null, {@link relativeDate} returns null.
* @see {@link relativeTime}
*/
static relativeDate(date, days) {
if (date == null || days == null)
return null;
let dt = new Date(date);
dt.setDate(dt.getDate() + days);
return dt;
}
/**
* Obtains a time that occurs a specified number of seconds after or before another time within a 24-hour period
* @param date A value of type time
* @param secs A long number of seconds
* @returns The time that occurs `secs` seconds after time if `secs` is greater than 0. Returns the time that occurs `secs` seconds before time if `secs` is less than 0. The maximum return value is 23:59:59. If any argument's value is null, {@link relativeTime} returns null
* @see {@link relativeDate}
*/
static relativeTime(date, secs) {
if (date == null || secs == null)
return null;
let dt = new Date(date);
dt.setSeconds(dt.getSeconds() + secs);
return dt;
}
/**
* Converts milliseconds to number of days
* @param ms Number of milliseconds
* @returns Number/interval of days
*/
static toDays(ms) {
return ms / Dates.msPerDay;
}
/**
* Converts date to UTC
* @param date The base date
* @returns The number of milliseconds, or `NaN` if the `date` is _null_.
*/
static toUTC(date) {
if (date == null)
return NaN;
return Date.UTC(date.getFullYear(), date.getMonth(), date.getDate(), date.getHours(), date.getMinutes(), date.getSeconds(), date.getMilliseconds());
}
/**
* Converts Date to localized ISO-string
*/
static toString(date, showTime = true) {
if (date == null)
return null;
return [date.getFullYear(), ('0' + (date.getMonth() + 1)).slice(-2), ('0' + date.getDate()).slice(-2)].join('-') +
((showTime) ?
"T" + [('0' + date.getHours()).slice(-2), ('0' + date.getMinutes()).slice(-2), ("0" + date.getSeconds()).slice(-2)].join(":") +
"." + date.getMilliseconds()
: "");
/*
let isoDate = date.toISOString();
if (!showTime) {
const pT = isoDate.indexOf("T");
if (pT >= 0)
isoDate = isoDate.substring(0, pT);
}
return isoDate;
*/
}
/**
* Gets the first date of the month
* @param date The base date. Default is the current date.
* @returns The calculated date, or _null_ if the `date` is _null_
* @see {@link dateEOM}
*/
static dateBOM(date) {
if (date === null)
return null;
date = date ?? Dates.getDate();
return new Date(date.getFullYear(), date.getMonth(), 1);
}
/**
* Gets the last date of the month
* @param date The base date. Default is the current date.
* @returns The calculated date, or _null_ if the `date` is _null_.
* @see {@link dateBOM}
*/
static dateEOM(date) {
if (date === null)
return null;
date = date ?? Dates.getDate();
return new Date(date.getFullYear(), date.getMonth() + 1, 0);
}
/**
* Gets the first date of the year
* @param date The base date. Default is the current date.
* @returns The calculated date, or _null_ if the `date` is _null_.
* @see {@link dateEOY}
*/
static dateBOY(date) {
if (date === null)
return null;
date = date ?? Dates.getDate();
return new Date(date.getFullYear(), 0, 1);
}
/**
* Gets the last date of the year
* @param date The base date. Default is the current date.
* @returns The calculated date, or _null_ if the `date` is _null_.
* @see {@link dateBOY}
*/
static dateEOY(date) {
if (date === null)
return null;
date = date ?? Dates.getDate();
return new Date(date.getFullYear(), 11, 31);
}
/**
* Gets the first date of quarter
* @param date The base date. Default is the current date.
* @returns The calculated date, or _null_ if the `date` is _null_.
* @see {@link dateEOQ}
*/
static dateBOQ(date) {
if (date === null)
return null;
date = date ?? Dates.getDate();
let quart = Dates.getQuarter(date);
let month = quart * 3;
return new Date(date.getFullYear(), month, 1);
}
/**
* Gets the last date of the quarter
* @param date The base date. Default is the current date.
* @returns The calculated date, or _null_ if the `date` is _null_.
* @see {@link dateBOQ}
*/
static dateEOQ(date) {
if (date === null)
return null;
date = date ?? Dates.getDate();
let quart = Dates.getQuarter(date);
let month = quart * 3;
return new Date(date.getFullYear(), month + 3, 0);
}
/**
* Gets the quarter number to which the `date` belongs
* @param date The base date. Default is the current date.
* @returns The quarter number starting from 0, or _null_ if the `date` is _null_.
*/
static getQuarter(date) {
if (date === null)
return null;
date = date ?? Dates.getDate();
let quart;
switch (date.getMonth()) {
case 0:
case 1:
case 2:
quart = 0;
break;
case 3:
case 4:
case 5:
quart = 1;
break;
case 6:
case 7:
case 8:
quart = 2;
break;
case 9:
case 10:
case 11:
quart = 3;
break;
default:
quart = NaN;
break;
}
return quart;
}
/**
* Return whether the provided year is a leap year
* @param year Year number to check
* @returns _true_ if `year` is a leap year, else _false_.
*/
static isLeapYear(year) {
return (year % 4 === 0 && year % 100 !== 0) || year % 400 === 0;
}
/**
* Returns the result of checking whether the number of hours in the specified date is less than 12
* @param date Date to check. Default is the current date
* @returns _true_ if hours of `date` is less than 12, else _false_.
*/
static isAM(date) {
if (date === null)
return null;
date = date ?? Dates.getDate();
return date.getHours() < 12;
}
/**
* Returns the result of checking whether the number of hours in the specified date is greater than or equal to 12
* @param date Date to check. Default is the current date
* @returns _true_ if hours of `date` is greater than or equal to 12, else _false_.
*/
static isPM(date) {
if (date === null)
return null;
date = date ?? Dates.getDate();
return date.getHours() >= 12;
}
/**
* Get ISO-8601 numeric representation of the day of the week
* 1 (for Monday) through 7 (for Sunday)
* @param date Source date. Default is current date.
* @returns The day of the week starting from 1, or _null_ if the `date` is _null_.
* @since 0.5.0
*/
static getDayOfWeek(date) {
if (date === null)
return null;
date = date ?? Dates.getDate();
let dow = date.getDay();
if (dow === 0) {
dow = 7;
}
return dow;
}
;
/**
* Gets a day number in year
* @param date Source date. Default is the current date
* @returns Day number in year, or _null_ if the `date` is _null_.
* @since 0.5.0
*/
static getDayOfYear(date) {
if (date === null)
return null;
date = date ?? Dates.getDate();
return Math.floor(Dates.daysAfter(Dates.dateBOY(date), date) + 1);
}
/**
* Gets a week number of month
* @param date Source date. Default is the current date
* @returns Week number of month, or _null_ if the `date` is _null_.
* @since 0.5.0
*/
static getWeekOfMonth(date) {
if (date === null)
return null;
const d = date ?? Dates.getDate();
const firstDay = new Date(d.getFullYear(), d.getMonth(), 1).getDay();
return Math.ceil((d.getDate() + (firstDay - 1)) / 7);
}
/**
* Get the ISO 8601 week number of year
* Based on comments from
* http://techblog.procurios.nl/k/n618/news/view/33796/14863/Calculate-ISO-8601-week-and-year-in-javascript.html
*
* @param date Source date. Default is the current date
* @returns ISO 8601 week number of year, or _null_ if the `date` is _null_.
* @since 0.5.0
*/
static getWeek(date) {
if (date === null)
return null;
date = date ?? Dates.getDate();
// Remove time components of date
const targetThursday = new Date(date.getFullYear(), date.getMonth(), date.getDate());
// Change date to Thursday same week
targetThursday.setDate(targetThursday.getDate() - ((targetThursday.getDay() + 6) % 7) + 3);
// Take January 4th as it is always in week 1 (see ISO 8601)
const firstThursday = new Date(targetThursday.getFullYear(), 0, 4);
// Change date to Thursday same week
firstThursday.setDate(firstThursday.getDate() - ((firstThursday.getDay() + 6) % 7) + 3);
// Check if daylight-saving-time-switch occurred and correct for it
const ds = targetThursday.getTimezoneOffset() - firstThursday.getTimezoneOffset();
targetThursday.setHours(targetThursday.getHours() - ds);
// Number of weeks between target Thursday and first Thursday
const weekDiff = (targetThursday - firstThursday) / (86400000 * 7);
return 1 + Math.floor(weekDiff);
}
;
}
Dates.msPerDay = 8.64e7;
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* This class consists exclusively of the static methods that operate on or return date/time values\r\n */\r\nexport class Dates {\r\n  private static msPerDay: number = 8.64e7;\r\n  /**\r\n   * Gets the current date and time\r\n   * @returns Current date/time value\r\n   */\r\n  static getDate(): Date {\r\n    return new Date();\r\n  }\r\n  /**\r\n   * Calculates the number of days in the month\r\n   * @param date Base date\r\n   * @returns Count of days\r\n   */\r\n  static daysInMonth(date: Date): number {\r\n    if (date == null)\r\n      return NaN;\r\n    const yy = date.getFullYear();\r\n    const mm = date.getMonth();\r\n    return Dates.toDays(Date.UTC(yy, mm + 1, 1) - Date.UTC(yy, mm, 1));\r\n  }\r\n  /**\r\n   * Calculates the number of days in the `quarter`\r\n   * @param year The number of the year.\r\n   * @param quarter The number of the quarter.\r\n   * @returns Count of days\r\n   */\r\n  static daysInQuarter(year?: number, quarter?: number): number {\r\n    const today = Dates.getDate();\r\n    year = year ?? today.getFullYear();\r\n    quarter = quarter ?? Dates.getQuarter(today)!;\r\n    return Dates.toDays(Date.UTC(year, (quarter + 1) * 3, 1) - Date.UTC(year, (quarter * 3), 1));\r\n  }\r\n  /**\r\n   * Calculates the number of days in the `year`\r\n   * @param year The number of the year. Default is the current year.\r\n   * @returns Count of days\r\n   */\r\n  static daysInYear(year?: number): number {\r\n    year = year ?? new Date(Date.now()).getFullYear();\r\n    return (Dates.toDays(Date.UTC(year + 1, 0, 1) - Date.UTC(year, 0, 1)));\r\n  }\r\n  /**\r\n   * Calculates the date of the first week's day in the month\r\n   * @param day Day of the week in range 0 Sunday to 6 Saturday\r\n   * @param month Month\r\n   * @param year Year\r\n   * @returns Date\r\n   */\r\n  static firstDayInMonth(day: 0 | 1 | 2 | 3 | 4 | 5 | 6, month: number, year: number): Date {\r\n    // day is in range 0 Sunday to 6 Saturday\r\n    const today = Dates.getDate();\r\n    year = year ?? today.getFullYear();\r\n    month = month ?? today.getMonth();\r\n    return new Date(year, month, 1 +\r\n      (day - new Date(year, month, 1).getDay() + 7) % 7);\r\n  }\r\n  /**\r\n   * Calculates the date of n-th week's day in the month\r\n   * @param n Ordered number\r\n   * @param day Day of week in range 0 Sunday to 6 Saturday\r\n   * @param month Month\r\n   * @param year Year\r\n   * @returns Date\r\n   */\r\n  static nthDayInMonth(n: number, day: 0 | 1 | 2 | 3 | 4 | 5 | 6, month: number, year: number): Date {\r\n    // day is in range 0 Sunday to 6 Saturday\r\n    const today = Dates.getDate();\r\n    year = year ?? today.getFullYear();\r\n    month = month ?? today.getMonth();\r\n    const d = Dates.firstDayInMonth(day, month, year);\r\n    return new Date(d.getFullYear(), d.getMonth(), d.getDate() + (n - 1) * 7);\r\n  }\r\n  /**\r\n   * Calculates the number of days to fixed `day` number\r\n   * @param day The day number in the current month\r\n   * @returns Number of days\r\n   */\r\n  static daysFromFixedDay(day: number): number {\r\n    const today = Dates.getDate();\r\n    const y = today.getFullYear();\r\n    const m = today.getMonth();\r\n    const d2 = today.getDate();\r\n    const dInPrevMonth = Dates.daysInMonth(new Date(y, m - 1, 1));\r\n    return (Dates.toDays(Date.UTC(y, m, d2) - Date.UTC(y, m, day)) + dInPrevMonth) % dInPrevMonth;\r\n  }\r\n  /**\r\n   * Determines the number of days one date occurs after another.\r\n   * @param date1 A date value that is the start date of the interval being measured\r\n   * @param date2 A date value that is the end date of the interval\r\n   * @returns {number} Returns a number of days date2 occurs after date1. If date2 occurs before date1, DaysAfter returns a negative number. If any argument's value is null, DaysAfter returns null.\r\n   */\r\n  static daysAfter(date1: Date, date2: Date): number | null {\r\n    if (date1 == null || date2 == null)\r\n      return null;\r\n    //var diff = new Date(+date2).setHours(12) - new Date(+date1).setHours(12);\r\n    //return Math.round(diff / Dates.msPerDay);\r\n    return Dates.toDays(Dates.toUTC(date2) - Dates.toUTC(date1));\r\n  }\r\n  /**\r\n   * Determines the number of seconds one date occurs after another.\r\n   * @param date1 A date value that is the start date of the interval being measured\r\n   * @param date2 A date value that is the end date of the interval\r\n   * @returns {number} Returns a number of seconds date2 occurs after date1. If date2 occurs before date1, DaysAfter returns a negative number. If any argument's value is null, DaysAfter returns null.\r\n   */\r\n  static secondsAfter(date1: Date, date2: Date): number | null {\r\n    if (date1 == null || date2 == null)\r\n      return null;\r\n    // var diff = new Date(+date2).getTime() - new Date(+date1).getTime();\r\n    const diff = Dates.toUTC(date2) - Dates.toUTC(date1);\r\n    return Math.round(diff / 1000);\r\n  }\r\n  /**\r\n   * Obtains the date that occurs a specified number of days after or before another date\r\n   * @param date A value of type date\r\n   * @param days An integer indicating a number of days\r\n   * @returns The date that occurs `days` after date if `days` is greater than 0. Returns the date that occurs `days` before date if `days` is less than 0. If any argument's value is null, {@link relativeDate} returns null.\r\n   * @see {@link relativeTime}\r\n   */\r\n  static relativeDate(date: Date, days: number): Date | null {\r\n    if (date == null || days == null)\r\n      return null;\r\n    let dt = new Date(date);\r\n    dt.setDate(dt.getDate() + days);\r\n    return dt;\r\n  }\r\n  /**\r\n   * Obtains a time that occurs a specified number of seconds after or before another time within a 24-hour period\r\n   * @param date A value of type time\r\n   * @param secs A long number of seconds\r\n   * @returns The time that occurs `secs` seconds after time if `secs` is greater than 0. Returns the time that occurs `secs` seconds before time if `secs` is less than 0. The maximum return value is 23:59:59. If any argument's value is null, {@link relativeTime} returns null\r\n   * @see {@link relativeDate}\r\n   */\r\n  static relativeTime(date: Date, secs: number): Date | null {\r\n    if (date == null || secs == null)\r\n      return null;\r\n    let dt = new Date(date);\r\n    dt.setSeconds(dt.getSeconds() + secs);\r\n    return dt;\r\n  }\r\n  /**\r\n   * Converts milliseconds to number of days\r\n   * @param ms Number of milliseconds\r\n   * @returns Number/interval of days\r\n   */\r\n  static toDays(ms: number): number {\r\n    return ms / Dates.msPerDay;\r\n  }\r\n  /**\r\n   * Converts date to UTC\r\n   * @param date The base date\r\n   * @returns The number of milliseconds, or `NaN` if the `date` is _null_.\r\n   */\r\n  static toUTC(date: Date | null): number {\r\n    if (date == null)\r\n      return NaN;\r\n    return Date.UTC(date.getFullYear(), date.getMonth(), date.getDate(), date.getHours(), date.getMinutes(), date.getSeconds(), date.getMilliseconds());\r\n  }\r\n  /**\r\n   * Converts Date to localized ISO-string\r\n   */\r\n  static toString(date: Date | null, showTime: boolean = true): string | null {\r\n    if (date == null)\r\n      return null;\r\n\r\n    return [date.getFullYear(), ('0' + (date.getMonth() + 1)).slice(-2), ('0' + date.getDate()).slice(-2)].join('-') +\r\n      ((showTime) ?\r\n        \"T\" + [('0' + date.getHours()).slice(-2), ('0' + date.getMinutes()).slice(-2), (\"0\" + date.getSeconds()).slice(-2)].join(\":\") +\r\n        \".\" + date.getMilliseconds()\r\n        : \"\");\r\n    /*\r\n    let isoDate = date.toISOString();\r\n    if (!showTime) {\r\n      const pT = isoDate.indexOf(\"T\");\r\n      if (pT >= 0)\r\n        isoDate = isoDate.substring(0, pT);\r\n    }\r\n\r\n    return isoDate;\r\n    */\r\n  }\r\n  /**\r\n   * Gets the first date of the month\r\n   * @param date The base date. Default is the current date.\r\n   * @returns The calculated date, or _null_ if the `date` is _null_\r\n   * @see {@link dateEOM}\r\n   */\r\n  static dateBOM(date?: Date | null): Date | null {\r\n    if (date === null) return null;\r\n    date = date ?? Dates.getDate();\r\n    return new Date(date.getFullYear(), date.getMonth(), 1);\r\n  }\r\n  /**\r\n   * Gets the last date of the month\r\n   * @param date The base date. Default is the current date.\r\n   * @returns The calculated date, or _null_ if the `date` is _null_.\r\n   * @see {@link dateBOM}\r\n   */\r\n  static dateEOM(date?: Date | null): Date | null {\r\n    if (date === null) return null;\r\n    date = date ?? Dates.getDate();\r\n    return new Date(date.getFullYear(), date.getMonth() + 1, 0);\r\n  }\r\n  /**\r\n   * Gets the first date of the year\r\n   * @param date The base date. Default is the current date.\r\n   * @returns The calculated date, or _null_ if the `date` is _null_.\r\n   * @see {@link dateEOY}\r\n   */\r\n  static dateBOY(date?: Date | null): Date | null {\r\n    if (date === null) return null;\r\n    date = date ?? Dates.getDate();\r\n    return new Date(date.getFullYear(), 0, 1);\r\n  }\r\n  /**\r\n   * Gets the last date of the year\r\n   * @param date The base date. Default is the current date.\r\n   * @returns The calculated date, or _null_ if the `date` is _null_.\r\n   * @see {@link dateBOY}\r\n   */\r\n  static dateEOY(date?: Date | null): Date | null {\r\n    if (date === null) return null;\r\n    date = date ?? Dates.getDate();\r\n    return new Date(date.getFullYear(), 11, 31);\r\n  }\r\n  /**\r\n   * Gets the first date of quarter\r\n   * @param date The base date. Default is the current date.\r\n   * @returns The calculated date, or _null_ if the `date` is _null_.\r\n   * @see {@link dateEOQ}\r\n   */\r\n  static dateBOQ(date?: Date | null): Date | null  {\r\n    if (date === null) return null;\r\n    date = date ?? Dates.getDate();\r\n    let quart: number = Dates.getQuarter(date)!;\r\n    let month: number = quart * 3;\r\n    return new Date(date.getFullYear(), month, 1);\r\n  }\r\n  /**\r\n   * Gets the last date of the quarter\r\n   * @param date The base date. Default is the current date.\r\n   * @returns The calculated date, or _null_ if the `date` is _null_.\r\n   * @see {@link dateBOQ}\r\n   */\r\n  static dateEOQ(date?: Date | null): Date | null {\r\n    if (date === null) return null;\r\n    date = date ?? Dates.getDate();\r\n    let quart: number = Dates.getQuarter(date)!;\r\n    let month: number = quart * 3;\r\n    return new Date(date.getFullYear(), month + 3, 0);\r\n  }\r\n  /**\r\n   * Gets the quarter number to which the `date` belongs\r\n   * @param date The base date. Default is the current date.\r\n   * @returns The quarter number starting from 0, or _null_ if the `date` is _null_.\r\n   */\r\n  static getQuarter(date?: Date | null): number | null {\r\n    if (date === null) return null;\r\n    date = date ?? Dates.getDate();\r\n    let quart: number;\r\n    switch (date.getMonth()) {\r\n      case 0:\r\n      case 1:\r\n      case 2:\r\n        quart = 0; break;\r\n      case 3:\r\n      case 4:\r\n      case 5:\r\n        quart = 1; break;\r\n      case 6:\r\n      case 7:\r\n      case 8:\r\n        quart = 2; break;\r\n      case 9:\r\n      case 10:\r\n      case 11:\r\n        quart = 3; break;\r\n      default:\r\n        quart = NaN; break;\r\n    }\r\n    return quart;\r\n  }\r\n  /**\r\n   * Return whether the provided year is a leap year\r\n   * @param year Year number to check\r\n   * @returns _true_ if `year` is a leap year, else _false_.\r\n   */\r\n  static isLeapYear(year: number): boolean {\r\n    return (year % 4 === 0 && year % 100 !== 0) || year % 400 === 0;\r\n  }\r\n  /**\r\n   * Returns the result of checking whether the number of hours in the specified date is less than 12\r\n   * @param date Date to check. Default is the current date\r\n   * @returns _true_ if hours of `date` is less than 12, else _false_.\r\n   */\r\n  static isAM(date?: Date | null): boolean | null {\r\n    if (date === null) return null;\r\n    date = date ?? Dates.getDate();\r\n    return date.getHours() < 12;\r\n  }\r\n  /**\r\n   * Returns the result of checking whether the number of hours in the specified date is greater than or equal to 12\r\n   * @param date Date to check. Default is the current date\r\n   * @returns _true_ if hours of `date` is greater than or equal to 12, else _false_.\r\n   */\r\n  static isPM(date?: Date | null): boolean | null {\r\n    if (date === null) return null;\r\n    date = date ?? Dates.getDate();\r\n    return date.getHours() >= 12;\r\n  }\r\n  /**\r\n   * Get ISO-8601 numeric representation of the day of the week\r\n   * 1 (for Monday) through 7 (for Sunday)\r\n   * @param  date Source date. Default is current date.\r\n   * @returns The day of the week starting from 1, or _null_ if the `date` is _null_.\r\n   * @since 0.5.0\r\n   */\r\n  static getDayOfWeek(date?: Date | null): number | null {\r\n    if (date === null) return null;\r\n    date = date ?? Dates.getDate();\r\n    let dow = date.getDay();\r\n    if (dow === 0) {\r\n      dow = 7;\r\n    }\r\n    return dow;\r\n  };\r\n  /**\r\n   * Gets a day number in year\r\n   * @param date Source date. Default is the current date\r\n   * @returns Day number in year, or _null_ if the `date` is _null_.\r\n   * @since 0.5.0\r\n   */\r\n  static getDayOfYear(date?: Date): number | null {\r\n    if (date === null) return null;\r\n    date = date ?? Dates.getDate();\r\n    return Math.floor( Dates.daysAfter(Dates.dateBOY(date)!, date)! + 1 );\r\n  }\r\n  /**\r\n   * Gets a week number of month\r\n   * @param date Source date. Default is the current date\r\n   * @returns Week number of month, or _null_ if the `date` is _null_.\r\n   * @since 0.5.0\r\n   */\r\n  static getWeekOfMonth(date?: Date | null): number | null {\r\n    if (date === null) return null;\r\n    const d = date ?? Dates.getDate();\r\n    const firstDay = new Date(d.getFullYear(), d.getMonth(), 1).getDay();\r\n    return Math.ceil((d.getDate() + (firstDay - 1)) / 7);\r\n  }\r\n  /**\r\n   * Get the ISO 8601 week number of year\r\n   * Based on comments from\r\n   * http://techblog.procurios.nl/k/n618/news/view/33796/14863/Calculate-ISO-8601-week-and-year-in-javascript.html\r\n   *\r\n   * @param  date Source date. Default is the current date\r\n   * @returns ISO 8601 week number of year, or _null_ if the `date` is _null_.\r\n   * @since 0.5.0\r\n   */\r\n  static getWeek(date?: Date | null): number | null {\r\n    if (date === null) return null;\r\n    date = date ?? Dates.getDate();\r\n    // Remove time components of date\r\n    const targetThursday = new Date(\r\n      date.getFullYear(),\r\n      date.getMonth(),\r\n      date.getDate()\r\n    );\r\n\r\n    // Change date to Thursday same week\r\n    targetThursday.setDate(\r\n      targetThursday.getDate() - ((targetThursday.getDay() + 6) % 7) + 3\r\n    );\r\n\r\n    // Take January 4th as it is always in week 1 (see ISO 8601)\r\n    const firstThursday = new Date(targetThursday.getFullYear(), 0, 4);\r\n\r\n    // Change date to Thursday same week\r\n    firstThursday.setDate(\r\n      firstThursday.getDate() - ((firstThursday.getDay() + 6) % 7) + 3\r\n    );\r\n\r\n    // Check if daylight-saving-time-switch occurred and correct for it\r\n    const ds = targetThursday.getTimezoneOffset() - firstThursday.getTimezoneOffset();\r\n    targetThursday.setHours(targetThursday.getHours() - ds);\r\n\r\n    // Number of weeks between target Thursday and first Thursday\r\n    const weekDiff = (<any>targetThursday - <any>firstThursday) / (86400000 * 7);\r\n    return 1 + Math.floor(weekDiff);\r\n  };\r\n\r\n}\r\n"]}