And 50% Levels - Minor seasonal dates.
In the settings you can change line colors and toggle the Offset. Offset is the way the script draws lines to show future dates, I offset by 365 so it will show incorrectly at some points in back testing.
In true TradingView spirit, the author of this script has published it open-source, so traders can understand and verify it. Cheers to the author! You may use it for free, but reuse of this code in a publication is governed by House Rules. You can favorite it to use it on a chart.