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import { cloneDate } from './clone-date';
import { getDaysInMonth } from './get-days-in-month';
export function addDate(date, unit, increment): Date
{
let newDate = cloneDate(date);
if (!unit || increment === 0)
{
return newDate;
}
switch (unit.toLowerCase())
{
case 'milli':
newDate = new Date(date.getTime() + increment);
break;
case 'second':
newDate = new Date(date.getTime() + (increment * 1000));
break;
case 'minute':
newDate = new Date(date.getTime() + (increment * 60000));
break;
case 'hour':
newDate = new Date(date.getTime() + (increment * 3_600_000));
break;
case 'day':
newDate.setUTCDate(date.getUTCDate() + increment);
break;
case 'week':
newDate.setUTCDate(date.getUTCDate() + increment * 7);
break;
case 'month': {
let day = date.getUTCDate();
if (day > 28)
{
const firstDayOfMonth = new Date(Date.UTC(date.getUTCFullYear(), date.getUTCMonth(), 1));
day = Math.min(day, getDaysInMonth(addDate(firstDayOfMonth, 'month', increment)));
}
newDate.setUTCDate(day);
newDate.setUTCMonth(newDate.getUTCMonth() + increment);
break;
}
case 'quarter':
newDate = addDate(date, 'month', increment * 3);
break;
case 'year':
newDate.setUTCFullYear(date.getUTCFullYear() + increment);
break;
default:
// nothing
}
if (date.__utc)
{
newDate.__utc = true;
}
return newDate;
}