JavaScript/Conversions/DateDayDifference.js at master · MMABSOUT/JavaScript · GitHub

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DateDayDifference Method

------------------------

DateDayDifference method calculates the number of days between two dates.

Algorithm & Explanation : https://ncalculators.com/time-date/date-difference-calculator.htm

import { isLeapYear } from '../Maths/LeapYear'

import { parseDate } from '../Timing-Functions/ParseDate'

const DateToDay = (dd, mm, yyyy) => {

return (

365 * (yyyy - 1) +

Math.floor((yyyy - 1) / 4) -

Math.floor((yyyy - 1) / 100) +

Math.floor((yyyy - 1) / 400) +

dd +

Math.floor((367 * mm - 362) / 12) +

(mm <= 2 ? 0 : isLeapYear(yyyy) ? -1 : -2)

)

}

const DateDayDifference = (date1, date2) => {

const firstDate = parseDate(date1)

const secondDate = parseDate(date2)

return Math.abs(

DateToDay(secondDate.day, secondDate.month, secondDate.year) -

DateToDay(firstDate.day, firstDate.month, firstDate.year)

)

}

// Example : DateDayDifference('17/08/2002', '10/10/2020') => 6630

export { DateDayDifference }

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