business-time-calculator
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Business Time Calculator is a simple tool to calculate the business time between two dates.
193 lines (192 loc) • 8.08 kB
JavaScript
export class BusinessTime {
constructor({ businessTimezone, businessDays, businessHours, holidays, }) {
this.computeWorkingHours = () => {
const workingHours = BusinessTime.computeWorkingHours(this.startOfDayTime.hour, this.endOfDayTime.hour);
return workingHours;
};
this.businessTimezone = businessTimezone;
this.businessDays = businessDays;
this.holidays = holidays;
this.startOfDayTime = {
hour: businessHours[0],
minute: 0,
second: 0,
};
this.endOfDayTime = {
hour: businessHours[1],
minute: 0,
second: 0,
};
}
isBusinessDay(datetime) {
const date = datetime.setZone(this.businessTimezone);
const dayMonth = date.toFormat('dd/MM');
if (this.holidays.includes(dayMonth))
return false;
if (this.businessDays.includes(date.weekdayLong.toLowerCase()))
return true;
return false;
}
computeBusinessDaysInInterval({ start, end, }) {
const businessHours = this.computeBusinessHoursInInterval({ start, end });
const workingHours = this.computeWorkingHours();
return businessHours / workingHours;
}
computeBusinessHoursInInterval({ start, end, }) {
return this.computeBusinessTimeInInterval({ start, end, unit: 'hours' });
}
computeBusinessMinutesInInterval({ start, end, }) {
return this.computeBusinessTimeInInterval({ start, end, unit: 'minutes' });
}
computeBusinessSecondsInInterval({ start, end, }) {
return this.computeBusinessTimeInInterval({ start, end, unit: 'seconds' });
}
computeBusinessTimeInInterval({ start, end, unit, }) {
if (start > end) {
throw new Error('start date is greater than end date');
}
const interval = {
start: this._moveDateInBusinessTime({ datetime: start }),
end: this._moveDateInBusinessTime({ datetime: end }),
};
let datetime = interval.start;
let businessTime = 0;
while (datetime < interval.end) {
if (!this.isBusinessDay(datetime)) {
datetime = datetime.plus({ days: 1 }).set(this.startOfDayTime);
continue;
}
if (datetime.toISODate() === interval.end.toISODate()) {
businessTime += interval.end.diff(datetime).as(unit);
datetime = interval.end;
}
else {
const endOfBusinessDay = datetime.set(this.endOfDayTime);
businessTime += endOfBusinessDay.diff(datetime).as(unit);
datetime = datetime.plus({ days: 1 }).set(this.startOfDayTime);
}
}
return businessTime;
}
/**
* Move the date in a business time (moveBehind = false)
* e.g. 06:00 => 10:00 of the current day
* e.g. 22:00 => 10:00 of the next day
*
* Move the date in a business time (moveBehind = true)
* e.g. 06:00 => 19:00 of the previous day
* e.g. 22:00 => 19:00 of the current day
*
* Warning ⚠️ _moveDateInBusinessTime doesn't retain the original timezone of the datetime in input, but it returns a datetime with the same timezone used to compute business times.
* It follows that behaviour because this method should be private and used only as helper. It is public only for testing purpose.
*/
_moveDateInBusinessTime({ datetime, moveBehind = false, }) {
let date = datetime.setZone(this.businessTimezone);
const start = date.set(this.startOfDayTime);
const end = date.set(this.endOfDayTime);
if (date < start) {
// Move datetime to the start / end of the business day
date = moveBehind
? date.minus({ days: 1 }).set(this.endOfDayTime)
: start;
}
if (date > end) {
// Move datetime to the start of the next / previous day
date = moveBehind
? date.set(this.endOfDayTime)
: date.plus({ days: 1 }).set(this.startOfDayTime);
}
while (!this.isBusinessDay(date)) {
// Move datetime to the start of the next / previous business day
date = moveBehind
? date.minus({ days: 1 }).set(this.endOfDayTime)
: date.plus({ days: 1 }).set(this.startOfDayTime);
}
return date;
}
addBusinessHoursToDate({ datetime, hours, }) {
return this.addBusinessSecondsToDate({ datetime, seconds: 3600 * hours });
}
addBusinessSecondsToDate({ datetime, seconds, }) {
if (seconds === 0) {
return datetime;
}
let date = this._moveDateInBusinessTime({ datetime });
let remainingSeconds = seconds;
while (remainingSeconds > 0) {
if (!this.isBusinessDay(date)) {
date = date.plus({ days: 1 });
continue;
}
const endOfBusinessDay = date.set(this.endOfDayTime);
const secondsUntilEndOfBusinessDay = endOfBusinessDay
.diff(date)
.as('seconds');
if (remainingSeconds <= secondsUntilEndOfBusinessDay) {
// remaining seconds are less than 1 business day
date = date.plus({ seconds: remainingSeconds });
remainingSeconds = 0;
}
else {
// Move to the start of the next day
date = date.plus({ days: 1 }).set(this.startOfDayTime);
remainingSeconds -= secondsUntilEndOfBusinessDay;
}
}
return date.set({ second: 0, millisecond: 0 }).setZone(datetime.zone);
}
removeBusinessHoursFromDate({ datetime, hours, }) {
return this.removeBusinessSecondsFromDate({
datetime,
seconds: 3600 * hours,
});
}
removeBusinessSecondsFromDate({ datetime, seconds, }) {
if (seconds === 0) {
return datetime;
}
let date = this._moveDateInBusinessTime({ datetime, moveBehind: true });
let remainingSeconds = seconds;
while (remainingSeconds > 0) {
if (!this.isBusinessDay(date)) {
date = date.minus({ days: 1 });
continue;
}
const startOfBusinessDay = date.hour === 0 && date.minute === 0
? date.minus({ days: 1 }).set(this.startOfDayTime)
: date.set(this.startOfDayTime);
const secondsFromStartOfBusinessDay = date
.diff(startOfBusinessDay)
.as('seconds');
if (remainingSeconds <= secondsFromStartOfBusinessDay) {
// remaining seconds are less than 1 business day
date = date.minus({ seconds: remainingSeconds });
remainingSeconds = 0;
}
else {
// Move to the end of the previous day
date = date.minus({ days: 1 });
// handle special case 24h business days. If it is midnight and endOfDayTime is midnight, we must not set the date to the end of the day, otherwise we lose the effect of removing 1 day
if (!(date.hour === 0 &&
date.minute === 0 &&
this.endOfDayTime.hour === 24)) {
date = date.set(this.endOfDayTime);
}
remainingSeconds -= secondsFromStartOfBusinessDay;
}
}
return date.set({ second: 0, millisecond: 0 }).setZone(datetime.zone);
}
hoursToDays(hours) {
const days = hours / this.computeWorkingHours();
return days;
}
}
BusinessTime.computeWorkingHours = (startHour, endHour) => {
if (endHour < startHour) {
const workingHours = Math.abs(Math.abs(startHour - 24) + endHour);
return workingHours;
}
const workingHours = endHour - startHour;
return workingHours;
};