Extract valors and time calculation

[Yarka]

hi,
I've a file as:
....
12 BC CA x xl 23:00:01,234 LAM
18 CA BC xa axj 23:30:12,333 KIL
4 VD GF ll pp 1:06:15,325 LOPP
55 III OP ghj poi 2:06:52,001 PO
.....

I need to obtain for each LAM of my file, the time passed between for LAM and 2 lines down. In this exemple, I want to have the time calculated with operation 1:06:15,325 - 23:00:01,234.
Can anybody help me??

Thanks.

 

[Ygor]

Try...

awk '/LAM/{ split($6,a,/[:,]/)
            x = a[1]*3600 + a[2]*60 + a[3] "." a[4]
            getline
            getline
            split($6, a, /[:,]/)
            y = a[1]*3600 + a[2]*60 + a[3] "." a[4]
            z =  y - x + (x>y?86400:0)
            printf "%02d:%02d:%02.3f\n", z/3600, (z%3600)/60, z%60
         }' file1

Result...

02:06:14.091