You need to return
the compairing value, either explicit
data.series = data.series.filter((item: any) => {
return item.date.getTime() >= fromDate.getTime() &&
item.date.getTime() <= toDate.getTime();
});
or without the brackets, implicit.
data.series = data.series.filter((item: any) =>
item.date.getTime() >= fromDate.getTime() && item.date.getTime() <= toDate.getTime()
);