The time ranges are set to the default Frankfurt, London, NY, Sydney and Tokyo, but can be
freely modified and turned off (I personally use to display only Tokyo and NY).
If you are a day trader, e.g. you trade with the Market Makers, this tool is a "must have".
It also displays the day of the week, which can be set off as well.
vitelot/yanez/Vts Sept 2019
PS I chose this script to belong to the "volatility" category since it can be used to highlight the Asian session,
and there was no suitable category available.