awk '
    /Entering/ { startt[$6, $(NF-2)] = $1 " " $2; next; }
    /Exiting/ {
        tn = $(NF-2);
        edt = $1 " " $2;            # bang together start/end time into "yyyy mm dd hh mm ss"
        sdt = startt[$6, tn];
        gsub( "[-:]", " ", sdt );
        gsub( "[-:]", " ", edt );
        gsub( ",", ".", edt );      # dont know if mktime handles fractions, so dropping them
        gsub( ",", ".", sdt );
        printf( "TN %s start: %s  end: %s %s diff: %.2f min\n", tn, startt[$6, tn], $1, $2, (mktime( edt ) - mktime( sdt ))/60 ); }
'  input-file >output-file

awk '
    BEGIN {
        epoch_yr = 1970;
        soup = "000031059090120151181212243273304334";          # sum of days in months prior to indexed month
    }

    # dt is yyyymmddhhmmss
    # returns seconds past epoch (unix time stamp)
    function time2spe( date, time,     dt, tm, y, m, d, yep, dep, ld, ldep, ssm )    # assumes time is adjusted to zulu, but for this it doesnt matter
    {
        split( date, dt, "-" );
        split( time, tm, ":" );
        tm[3] = tm[3] + 0;          # drop fraction
        y = dt[1];                  # unnecessary, but easier to read
        m = dt[2];
        d = (dt[3] + substr( soup, (m*3)-2, 3 ))-1;          # sum of days before the day indicated in dt

        ssm = (tm[1] * 3600) + (tm[2] * 60) + tm[3];   # seconds since midnight for given date/time

        yep = y - epoch_yr;                 # years since epoch, before date year
        dep = yep * 365;                    # normal days since epoch, but before date year
        ldep = int((yep-1)/4);              # leap days since epoch, not including date year

        if( (ld = m > 2 ? ( y % 4 == 0 ? 1 : 0) : 0) )  # possible leap day this year?  count only if we are march or beyond
            if( (y % 100 == 0) && (y % 400) )           # century years must also be divisible by 400 to be a leap year
                ld = 0;                                 # if it is not, then reset ld count

        return ((dep + ldep + ld + d) * 86400) + ssm;
    }


    /Entering/ {
            startd[$6, $(NF-2)] = $1;
            startt[$6, $(NF-2)] = $2;
            next;
    }
    /Exiting/ {
        tn = $(NF-2);
        st = startt[$6, tn];    # easier to read
        sd = startd[$6, tn]
        printf( "TN %s start: %s %s  end: %s %s diff: %.2f min\n", tn, sd, st, $1, $2, (time2spe( $1, $2 ) - time2spe( sd, st ))/60 ); 
    }
' input-file >output-file

grep "getRackInfo" input-file | awk ' ...... ' >output'file