Js-Date-Extensions

A few useful extensions for the javascript object Date

Table of contents

• Js-Date-Extensions
  • Table of contents
  • generell methods
    • setLocale
    • getUnits
    • getDayNames
    • getMonthNames
  • Method that manipulate the Date object
    • addDays
    • subDays
    • addMonths
    • subMonths
  • Methods that return a new instance of the Date object
    • clone
    • copy
    • getFirstDayOfMonth
    • getLastDayOfMonth
    • getFirstDayOfWeek
    • getLastDayOfWeek
  • Test methods that return none date object
    • isLeapYear
    • isMonday, isTuesday, isWednesday, isThursday, isFriday, isSaturday, isSunday
    • getDaysInMonth
    • getWeek
    • getCountWeeks
    • getCountDays
    • fromNow
    • getDayName
    • getMonthName
    • getMonthCalendar

generell methods

setLocale

Set the language

// example
Date.setLocale('de');

getUnits

Fetches the time units in milliseconds
@return {object}

// example
Date.getUnits();
// { year: 31536000000, month: 2628000000, week: 604800000, day: 86400000, hour: 3600000, minute: 60000, second: 1000 }

getDayNames

@param {boolean} abbreviation Default false
@returns {string[]}

// example
Date.getDayNames(true); // [ "Mo", "Di", "Mi", "Do", "Fr", "Sa", "So" ]

getMonthNames

@param {boolean} abbreviation Default false
@returns {string[]}

// example
Date.getMonthNames(true); // [ "Jan", "Feb", "Mär", "Apr", "Mai", "Jun", "Jul", "Aug", "Sep", "Okt", "Nov", "Dez"]

Method that manipulate the Date object

addDays

Adds a specified number of days to the date
@param {number} days
@return {Date}

// example
let date = new Date('2022-11-01');
date.addDays(4); // 2022-11-05

subDays

Subtracts a specified number of days from the date
@param {number} days
@returns {Date}

// example
let date = new Date('2022-11-01');
date.subDays(4); // 2022-10-28

addMonths

Adds a specified number of months to the date
@param {number} months
@returns {Date}

// example
let date = new Date('2022-11-01');
date.addMonths(4); // 2023-03-01

subMonths

Subtracts a specified number of months from the date
@param {number} months
@returns {Date}

// example
let date = new Date('2022-11-01');
date.subMonths(1); // 2022-10-01

Methods that return a new instance of the Date object

clone

@returns {Date}

// example
let date = new Date('2022-11-01');
let cloneDate = date.clone(); // 2022-11-01

copy

Returns a new instance of the Date object (alias of clone)
@returns {Date}

// example
let date = new Date('2022-11-01');
let copyDate = date.copy(); // 2022-11-01

getFirstDayOfMonth

Determine the first day of the current month
@returns {Date}

// example
let date = new Date('2022-11-10');
let firstOfMonth = date.getFirstDayOfMonth(); // 2022-11-01

getLastDayOfMonth

Determine the last day of the current month
@returns {Date}

// example
let date = new Date('2022-11-10');
let firstOfMonth = date.getLastDayOfMonth(); // 2022-11-30

getFirstDayOfWeek

Determine the previous Monday of the current date
@returns {Date}

// example
let date = new Date('2022-11-10');
let prevMonday = date.getFirstDayOfWeek(); // 2022-11-07

getLastDayOfWeek

Determine the Sunday of the current date
@returns {Date}

// example
let date = new Date('2022-11-10');
let nextSunday = date.getLastDayOfWeek(); // 2022-11-13

Test methods that return none date object

isLeapYear

Checks if the year of the date is a leap year
@returns {boolean}

// example
let date = new Date('2024-11-01');
if (date.isLeapYear()) // true
{
    // do something
}

isMonday, isTuesday, isWednesday, isThursday, isFriday, isSaturday, isSunday, isWeekend

Checks the date for a weekday
@returns {boolean}

// example
let date = new Date('2022-11-01');
date.isMonday(); // false
date.isTuesday(); // true
date.isWednesday(); // false
date.isThursday(); // false
date.isFriday(); // false
date.isSaturday(); // false
date.isSunday(); // false
date.isWeekend(); // false

getDaysInMonth

Determine the number of days in the current month
@returns {number}

// example
let date = new Date('2022-11-01');
date.getDaysInMonth(); // 30

getWeek

Determines the calendar week of the date
@returns {number}

// example
let date = new Date('2022-11-01');
date.getWeek(); // 44 

getCountWeeks

Determines the number of weeks between two dates
@param {Date} toDate
@returns {number}

// example
let date = new Date('2022-11-01');
let toDate = new Date('2022-11-14');
date.getCountWeeks(toDate); // 2

getCountDays

Determines the number of days between two dates
@param {Date} toDate
@returns {number}

// example
let date = new Date('2022-11-01');
let toDate = new Date('2022-11-14');
date.getCountDays(toDate); // 14

fromNow

let date = new Date('2022-11-06 23:54:00');
// Now: 2022-11-07 05:55:00
date.fromNow(); // vor 6 Stunden

getDayName

let date = new Date('2022-11-06 23:54:00');
// Now: 2022-11-07 05:55:00
date.getDayName(); // Sonntag

getMonthName

let date = new Date('2022-11-06 23:54:00');
// Now: 2022-11-07 05:55:00
date.getMonthName(); // November

getMonthCalendar

Returns all data of one month as array
@return {*[]}

// example
let date = new Date('2022-11-01');
let result = date.getMonthCalendar();
// output result
[
    {
        "week": 44,
        "days": [
            "2022-10-31T23:00:00.000Z",
            "2022-11-01T23:00:00.000Z",
            "2022-11-02T23:00:00.000Z",
            "2022-11-03T23:00:00.000Z",
            "2022-11-04T23:00:00.000Z",
            "2022-11-05T23:00:00.000Z",
            "2022-11-06T23:00:00.000Z"
        ]
    },
    {
        "week": 45,
        "days": [
            "2022-11-07T23:00:00.000Z",
            "2022-11-08T23:00:00.000Z",
            "2022-11-09T23:00:00.000Z",
            "2022-11-10T23:00:00.000Z",
            "2022-11-11T23:00:00.000Z",
            "2022-11-12T23:00:00.000Z",
            "2022-11-13T23:00:00.000Z"
        ]
    },
    {
        "week": 46,
        "days": [
            "2022-11-14T23:00:00.000Z",
            "2022-11-15T23:00:00.000Z",
            "2022-11-16T23:00:00.000Z",
            "2022-11-17T23:00:00.000Z",
            "2022-11-18T23:00:00.000Z",
            "2022-11-19T23:00:00.000Z",
            "2022-11-20T23:00:00.000Z"
        ]
    },
    {
        "week": 47,
        "days": [
            "2022-11-21T23:00:00.000Z",
            "2022-11-22T23:00:00.000Z",
            "2022-11-23T23:00:00.000Z",
            "2022-11-24T23:00:00.000Z",
            "2022-11-25T23:00:00.000Z",
            "2022-11-26T23:00:00.000Z",
            "2022-11-27T23:00:00.000Z"
        ]
    },
    {
        "week": 48,
        "days": [
            "2022-11-28T23:00:00.000Z",
            "2022-11-29T23:00:00.000Z",
            "2022-11-30T23:00:00.000Z",
            "2022-12-01T23:00:00.000Z",
            "2022-12-02T23:00:00.000Z",
            "2022-12-03T23:00:00.000Z",
            "2022-12-04T23:00:00.000Z"
        ]
    }
]

getWeekCalendar

Returns all data of one week as array
@return {*[]}

// example
let date = new Date('2023-02-09');
let result = date.getWeekCalendar();
// output result
[
    "2023-02-06T23:00:00.000Z",
    "2023-02-07T23:00:00.000Z",
    "2023-02-08T23:00:00.000Z",
    "2023-02-09T23:00:00.000Z",
    "2023-02-10T23:00:00.000Z",
    "2023-02-11T23:00:00.000Z",
    "2023-02-12T23:00:00.000Z",
]