How to display week numbers on a chart’s axis

I have time series data visualized on a line chart and want to format the x-axis accordingly. I wonder what format to choose in English if the data is aggregated by week. In German i would use "KW x".

  • I found this discussion, that suggests "Week x" if you want to translate the German word "Kalenderwoche (KW) x" to English.
  • Also google calendar is using this format.

  • Moment.js offers some other options

    moment.js

Anyone else has any input one this?