# Get total sums for last 3, 7, 30 and 90 days with moment

I have an array of orders with created_at and total fields, where created_at is the date the order was created and total is what the user paid, now I want to get the sum of the totals for four different date intervals, last 3 days, 7 days, 30 days and 90 days, how can I use moment to check if an order is between these intervals and get the total sum for each interval.

```const getIntervalsSum = (orders) =>
{
var threeDaysSum = 0;
var sevenDaysSum = 0;
var thirtyDaysSum = 0;
var ninetyDaysSum = 0;

for(var i=0; i<orders.length;i++)
{
//check interval with moment() here and add to respective sums
}

};
```

I think one generic function best suits this situation. Haven’t used moment before but based on the docs, this looks like it will work.

```const totalOrders = (orders, daysAgo) => {
let sum = 0;
const then = moment().subtract(daysAgo, 'days');

orders.forEach((order) => {
if (moment(order.created_at).isAfter(then)) {
sum += order.total;
}
});

return sum;
}
```