One of many ways to utilize the "dayofweek" variable.
Currently there are no options to draw a vertical line, you can do a background color for the candle.
Future plans - Include monthly option expiry.
// Created by UCSgears // Simple script to show you Fridays (Weekly Options Expiry) // Will release a version for Monthly Option Expiry study("UCS_Fridays", overlay = true) x = dayofweek == 6 ? 1 : 0 plotshape(x, style = shape.xcross, location = location.top, title="Show Me Fridays")