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I have the following code:
students=List[List[DateObject[List[2016,1,1,0,0,0.`],"Instant","Gregorian",-4.`],DateObject[List[2016,9,1,0,0,0.`],"Instant","Gregorian",-4.`],DateObject[List[2017,11,1,0,0,0.`],"Instant","Gregorian",-4.`],DateObject[List[2018,1,1,0,0,0.`],"Instant","Gregorian",-4.`],...