This depends on which of our educational programs you are applying for.
The MSc in Financial Engineering (MScFE) degree program is offered on a quarterly schedule with four possible start dates per year. You can find the next upcoming deadline at https://www.wqu.edu/programs/mscfe/.
The Applied Data Science Lab is an open enrollment offering. This means that you can apply and start on any given day if you successfully complete your application and meet all requirements for admission.