vecka-cli

Som vecka.nu fast i terminal

$ npm install vecka-cli -g

usage example

$ vecka
11

vecka followed by a number (week) gives you the date range of that week for current year:

$ vecka 11
Mon Mar 14 2016 - Sun Mar 20 2016

vecka followed by a date returns week of that date.

$ vecka 2016-03-14
11