Support weeks

[nijk]

Is your feature request related to a problem? Please describe.
Component only supports days, hours, minutes & seconds

Describe the solution you'd like
I'd like to be able to use weeks

Additional context
It is feasible that we could also support years and months, but calculating months will be complex to get right. One option would be to set a month to 365 / 12 but this could cause poor UX due to a month equating to a seemingly arbitrary number of seconds:

365 / 12
= 30.4166666666666667 * 24 * 60 * 60
= 2628000