When setting up your Reddit Advertising campaign you’ll need to select an end date. In many advertising platforms ‘end date’ typically means the last day your ad will run. However, with Reddit’s advertising platform this means that no ads will run on this day, so your last day for the ad to run will be the day before the ‘end date’ you set.
This was brought up by Reddit user /u/auvik_shaun and is a good thing to keep note of when planning out your campaign. Read about it here.