get recodes bigger then date and time

i have a table with 3 colums:

• date
• start_time
• end_time

and i want to get all the recorders that 1: bigger then now() 2. if is today bigget then end_time then now()

i didnt found how to make that with eloquent

and how i can do somthing like this:

where('date' ,>=, ,now()) and i didnt now how to do that: if date = today get only the recordes the end_time is bigger from now()

thanks