[RRFC] Support relative dates in --before #844
Description
Motivation ("The Why")
My personal motivation is that I would like to be able to set the --before in the .npmrc configuration file of my project (with the goal of reducing the chances of pulling down malware under the assumption that third-parties continuously scan the registry for malware). However, I can also see this being a more convenient way to specify the value than having to compute and write out a date value (especially trying to decide in what order to specify the month/date/year).
Example
In an "ideal" world it could look something like:
npm install --before '2 days ago'Perhaps more realistic is to provide a negative amount of days (or another precision):
npm install --before '-1' # yesterdayHow
Current Behaviour
The --before argument value should be a date.
Desired Behaviour
The --before argument can be a value relative to today's date.