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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
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