custom format text to time

[paul w]

hello,
im not even sure if this is possible, on my time sheet I have to enter the hours used as eg. 38 hrs 00 mins.
ive managed to sort a custom format [hh] "hrs" mm "mins" to format. 38:00 to , "38 hrs 00 mins"
is there any way of formatting the cell so all i have to enter is 3800 without the colon and it would change to 38 hrs 00 mins,
the rest of my times are entered as 24hr so i use the formatting 00\:00 it is only this one section about 30 cells that payroll require it as hrs mins,
thanks in advance
paul

 

[paul w]

solved.
thanks everyone for your help, the VBA route would have been a lot easier but unfortunately our payroll dept.firewall sometimes kicks out macro enabled time sheets