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let base_year = 2000;
let days_in_month = [31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31];
let days = ["sat", "sun", "mon", "tue", "wed", "thu", "fri"];
function is_leap_year(year) {
if (year % 400 == 0) {
return true;
}
if (year % 100 == 0) {
return false;
}
if (year % 4 == 0) {
return true;
}
return false;
}
function weekday(year, month, day) {
let skip_days = year - base_year;
for (let yr = base_year; yr < year; yr++) {
if (is_leap_year(yr)) {
skip_days++;
}
}
if (is_leap_year(year) && month > 2) {
skip_days++;
}
for (let m = 1; m < 13; m++) {
if (m < month) {
skip_days += days_in_month[m-1];
}
}
skip_days += day - 1;
return days[skip_days % 7];
}
function is_weekend(year, month, day) {
let today = weekday(year, month, day);
if (today == "sat" || today == "sun") {
return true;
}
return false;
}
function is_holiday(bank_holidays, year, month, day) {
let date = format_date(year, month, day);
for (let hol in bank_holidays) {
if (hol == date) {
return true;
}
}
return false;
}
function format_date(year, month, day) {
let yr = year.toString();
let mn = month.toString().padStart(2,'0');
let da = day.toString().padStart(2,'0');
return yr+"-"+mn+"-"+da;
}
function parse_date(date) {
let year = "";
let month = "";
let day = "";
for (let d of date) {
if (d == "-") {
continue;
}
if (year.length < 4) {
year += d;
} else if (month.length < 2) {
month += d;
} else if (day.length < 2) {
day += d;
}
}
yr = year;
mth = month;
da = day;
return [yr, mth, da];
}
function proc(start_date, offset, bank_holidays) {
let result = parse_date(start_date);
let year = result[0];
let month = result[1];
let day = result[2];
let new_year = year;
let new_month = month;
let new_day = day;
let steps = offset;
while (steps > 0) {
let leap = 0;
if (is_leap_year(new_year) && (new_month == 2)) {
leap = 1;
}
if (new_day + 1 > days_in_month[new_month - 1] + leap) {
if (new_month == 12) {
new_year++;
}
new_month++;
if (new_month == 13) {
new_month = 1;
}
new_day = 1;
} else {
new_day++;
}
if (!(is_holiday(bank_holidays, new_year, new_month, new_day)) && !(is_weekend(new_year,new_month,new_day))) {
steps--;
}
}
let new_date = format_date(new_year, new_month, new_day);
console.log("Input:", start_date, "offset:", offset);
if (bank_holidays.length > 0) {
for (let h of bank_holidays) {
console.log("\tHoliday:",h);
}
}
console.log("Output:", new_date);
}
function mn() {
let start_date = "2018-06-28";
let offset = 3;
let bank_holiday1 = "2018-07-03";
let bank_holidays = [bank_holiday1];
proc(start_date, offset, bank_holidays);
}
mn();
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