Hi, so I have data that I can retrieve based on an input start, end time and time interval between measurements. Based on these inputs, I have made a dynamic chart that will plot the date on the x axis and flow on the y axis. However, I have certain dates that I want to mark indicating some type of work being done, and I am wondering how I can include a set list of dates that will show up if those dates fall in between my input start and end time? Thank-you and I can post my spreadsheet for further clarification.