Adding a month appears to be adding 30 days?

This code in ts-node:

import { add } from 'date-fns';

let date = new Date('2020-07-01');
console.log(date);

let next = add(date, { months: 1 });
console.log(next);

Outputs the following:

2020-07-01T00:00:00.000Z
2020-07-31T00:00:00.000Z

When adding 1 month, my expectation was that 07-01 would become 08-01. What am I missing here? Thanks!

[SonofNun15]

Actually it was as simple as setting the timezone to utc for the node process. Thank you so much for your help!

process.env.TZ = 'UTC';

[SonofNun15]

Thanks!