Startup Idea: Employee Self-Service Time Management Software

Startup idea to create a software that not only allows employees to track their working hours, but also manage pto schedules and swap shifts with other employees.

Hello I am looking for a software where people can keep track of their own hours that they worked. Not just ordinary time sheet program but one that would be able to them to schedule pto hours and well a app that can allows employees to swap days and times with other employees.