A deadline is a time or date before which a particular task must be finished or a particular thing must be done. Deadline = the last day to submit your work or deliver what you have promised or what is set out for you to accomplish.If you can submit the application on Dec 15th at pm you're good. Once the clock strikes you missed the deadline. A submission date is the day when something is due or needs to be turned in. It could be for school work, a job application, or even a legal case. "Open until filled" means that we are free to continue reviewing candidates after that date. Tight deadline We're working to a tight deadline. A deadline is a time or date before which a particular task must be finished or a particular thing must be done. In many cases, your application will be automatically disqualified if you miss the submission deadline. 2. 0.