Sorting a column by a different value

[emdrayallday]

Problem

I have 3 columns that display information based off of essentially the same value, a UTC time.

Example data structure

{
    startTime: '2023-02-24T19:31:34.470Z',
    range: '10:00 pm - 12:00 am',
    date: 'Friday, 12th',
    startDate: '11/12/23'
}

I want to display all columns except the startTime however I want a custom sort function to apply to all of these that uses the startTime as the value to sort on.

I know how to use a custom sort fn, but I have not been able to figure out how to sort by a different value than the column being sorted