We have only 2 functionality in our app.

To mark the check-in time - when the user clicks on the check in time, we record the time and then later on the same date, the user can click on the check out and again the time is recorded. This is basically for employees who are working remotely to note their starting and end time in a day.The user can not check out till he/she has done the check in.
To send approval requests to the supervisor in case the user is unable to check in the previous date. Here the user selects date and time and sends an approval request to the supervisor to confirm his/her availability on the job the previous day.
There is no other functionality, it's just a time recording app for the employee and management to track the employee timings for record. Hence I request you to kindly approve the app without delay.