I want to create a downtime analysis. The runtime tag is called 'TFT' and has values as a string in the format "dd:hh:mm:ss". I want to define an analysis to determine the time when each reactor isn't running, using the TimeEq function. We just created this tag recently, but going forward I want to make this a totalized downtime from August 1st at midnight. Once this works, I will do a rollup to sum this on every reactor. However, I get this error shown in the screenshot. How can I input a specific timestamp as the start time in my performance equation?