change date format to absolute number

i have a column with times of day and need a helper column to show the starting hour. for example, column a1 - 9:53am would like b1 to show 9am or 9. i tried customizing the date format to 'h' only, but when I pivot the table it still shows several 9's

Please use a supporting column B & in B1 use =HOUR(A1) & it will show absolute number

thanks that was what i needed