Unless this is the absolute only place that's using dates/times it's worth bringing in a library for this. The built in Date class is miserable. Also see the ne

Unless this is the absolute only place that's using dates/times it's worth bringing in a library for this. The built in Date class is miserable. Also see the new Temporal proposal https://github.com/tc39/proposal-temporal https://github.com/tc39/proposal-temporal