nse-business-time/src/date-mgmt/date-utils.js

Calculate Business Time for NSE,BSE,MCX and NFO

const moment  = require('moment');
const momentz = require('moment-timezone');
const _cnst   = require('../utils/constants');

const _open_scheduling = require('./open-and-scheduling-time');
const _holidayList     = require('../utils/holiday-list');


function getLastWorkingDay(){

    let yesterday = moment().add(-1, 'days').valueOf();
    let weekday   = moment(yesterday).isoWeekday();

    while([6,7].indexOf(weekday) !== -1){
        yesterday = moment(yesterday).add(-1, 'days').valueOf();
        weekday   = moment(yesterday).isoWeekday();
    }
    return yesterday;
}

function getNextWorkingDay(exchange, today){

    let nextDay   = moment(today).add(1, 'days').valueOf();

    while(_holidayList.isHoliday(exchange, nextDay)){
        nextDay   = moment(nextDay).add(1, 'days').valueOf();
    }
    
    return nextDay;
}

function covnertToString(milliseconds){
    return momentz(milliseconds).tz(_cnst.TIME_ZONE).format(_cnst.DATE_FORMAT);
}

function marketOpenForExchange(exchange, time){
    let startDate= momentz.tz(covnertToString(time) + " " + _cnst.O_MKT_START[exchange], _cnst.DATE_TIME_FORMAT, _cnst.TIME_ZONE).valueOf();
    return startDate;
}

function getNextOpenTime(exchange, currentTime=0){

    if(currentTime === 0){
        currentTime = momentz().tz(_cnst.TIME_ZONE).valueOf();
    }

    if(_cnst.O_MKT_TIMING.OPEN[exchange] === 0 || !_cnst.O_MKT_TIMING.OPEN[exchange]){
        _open_scheduling.marketOpenTime (currentTime);
        _open_scheduling.marketCloseTime(currentTime);
    }

    let start = _cnst.O_MKT_TIMING.OPEN[exchange];

    if(currentTime <= start){
        return start;
    }else{
        let nextDay = getNextWorkingDay(exchange, currentTime);
        return marketOpenForExchange(exchange, nextDay);
    }
}

function getLastOpenTime(exchange, currentTime=0){

    if(currentTime === 0){
        currentTime = momentz().tz(_cnst.TIME_ZONE).valueOf();
    }

    if(_cnst.O_MKT_TIMING.OPEN[exchange] === 0 || !_cnst.O_MKT_TIMING.OPEN[exchange]){
        marketOpenTime (currentTime);
        marketCloseTime(currentTime);
    }

    let start = _cnst.O_MKT_TIMING.OPEN[exchange];

    if(currentTime >= start){
        return start;
    }else{
        let nextDay = getLastWorkingDay();
        return marketOpenForExchange(exchange, nextDay);
    }
}

function getCurrentOpenTime(exchange, currentTime=0){

    if(currentTime === 0){
        currentTime = momentz().tz(_cnst.TIME_ZONE).valueOf();
    }

    if(_cnst.O_MKT_TIMING.OPEN[exchange] === 0 || !_cnst.O_MKT_TIMING.OPEN[exchange]){
        marketOpenTime (currentTime);
        marketCloseTime(currentTime);
    }

    let start = _cnst.O_MKT_TIMING.OPEN[exchange];
    return start;
}

exports.getLastWorkingDay       = getLastWorkingDay;
exports.getNextWorkingDay       = getNextWorkingDay;

exports.getNextOpenTime         = getNextOpenTime;
exports.getLastOpenTime         = getLastOpenTime;

exports.getCurrentOpenTime      = getCurrentOpenTime;