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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 | 3x 3x 10x 10x 10x 10x 10x 3x | const { leapYear, toGurmukhiNum } = require( './utils' ) const { months, weekdays } = require( './consts' ) /** * Converts Nanakshahi Date into the Gregorian Calendar * @param {!number} year Nanakshahi Year * @param {!number} month Nanakshahi Month, 1-12 * @param {!number} date Nanakshahi Day * @return {Object} Gregorian Date + Nanakshahi Date in English and Punjabi * @example getDateFromNanakshahi( 550, 10, 23 ) */ function getDateFromNanakshahi( year, month, date ) { // Check if before 535 N.S. (Nanakshahi Adoption) Iif ( year < 535 ) { throw new RangeError( 'Nanakshahi Date Out of Range' ) } // NS Month Offsets const monthOffsets = [ 14, 14, 15, 15, 16, 16, 15, 15, 14, 14, 13, 12 ] // Date Object const gregorianDate = new Date( // Calculate Gregorian Year month < 11 ? year + 1468 : year + 1469, // Set month start from Nanakshahi [0..11] month < 11 ? month + 1 : month - 11, // Add days to months monthOffsets[ month - 1 ] + ( date - 1 ), ) // Get Day of Week const weekday = gregorianDate.getDay() return { gregorianDate, englishDate: { month, monthName: months[ month - 1 ].en, date, year, day: weekdays[ weekday ].en, dayShort: weekdays[ weekday ].enShort, }, punjabiDate: { month: toGurmukhiNum( month ), monthName: months[ month - 1 ].pa, date: toGurmukhiNum( date ), year: toGurmukhiNum( year ), day: weekdays[ weekday ].pa, dayShort: weekdays[ weekday ].paShort, }, leapYear: leapYear( year + 1469 ), } } module.exports = getDateFromNanakshahi |