Counting time ?

Hi

you do not know how to add time? I need to calculate the time spent and I only have data in hours, minutes and seconds.

The result should be in the format:
for example
0 Years, 0 Days, 1 Day, 12 Hours, 15 Minutes, 9 Seconds

Input the number of hours and minutes (non-standard format):

HHHH: MM: SS

a = 0012:23:05 - 12 hours: 23 minutes: 05 seconds
b = 0112:15:01 - 112 hours 15 minutes: 01 seconds
c = 0053:15:09 - 53 hours 15 minutes: 09: seconds

a + b + c =

result in the following format:
0 Years, 0 Days, 1 Day, 12 Hours, 15 Minutes, 9 Seconds

thx:duck: