in-milliseconds

Simply convert days, weeks, months, etc. to milliseconds.

And that's basically it. Typescript supported.

Also check out in-seconds

import inMilliSeconds from "in-milliseconds";

inMilliSeconds.seconds(2) // 2000
inMilliSeconds.minutes(2) // 120000
inMilliSeconds.hours(2) // 7200000
inMilliSeconds.days(5) // 432000000
inMilliSeconds.weeks(4) // 2419200000
inMilliSeconds.months(11) // 28512000000
inMilliSeconds.years(2) // 63072000000

Important note

months calculates with 30 days per month. You can change that by passing a number for the daysInMonth argument (it's the second argument).

years calculates with 365 days per year. You can change that by passing a number for the daysInYear argument (it's the second argument).