Add constants for max and min dates

[graingert]

const maxMillis = (10 ** 8) * 24 * 60 * 60 * 1000;
export const maxDate = new Date(maxMillis);
export const epochDate = new Date(0);
export const minDate =  new Date(-maxMillis);

[ThePaulMcBride]

I'd be happy to do this if you could explain a little more about what the issue is.

[graingert]

It's just for convenience

[kossnocorp]

I've reworked the constants:

• minTime & maxTime instead of minDate & maxDate as having them as numbers makes more sense.
• Removed epochDate as it could be represented by simple 0