Add string constants DEFAULT_START_HOUR_VALUE, DEFAULT_START_MINUTE_VALUE, DEFAULT_END_HOUR_VALUE, DEFAULT_END_MINUTE_VALUE
Change startDateTime to startDate and startTime, change endDateTime to endDate and endTime. Modify all the code that depends on these attributes in the Storage package.
Create convertParsedDetailsToTask function to help create a new task after parsing the information. Create a new java file AddHandlerTest.java to test the AddHandler class.