The following visualization is meant to guide you through the OPT application process by showing you a timeline of important dates. Enter the date of your last class as a Calvin Student for End Date. Enter your desired employment start date (the date you will request on your USCIS application, which should be within 60 days from your program end date) for Start Date. If your major qualifies as a Science, Technology, Engineering or Mathematics (STEM) designated major, select yes to view the timeline to apply for the STEM extension.