", right: "
$ T_{\text{seconds}} = (\text{hours} \times 3600) + (\text{minutes} \times 60) + \text{seconds} $
$ \Delta T = (T_{end, \text{seconds}} - T_{start, \text{seconds}}) $
$ \text{If } \Delta T < 0, \text{ then } \Delta T_{\text{final}} = \Delta T + 86400 $
$ T_{total} = \sum_{i=1}^{n} (\pm t_{i, \text{seconds}}) $
$ \text{Hours} = \lfloor \frac{T_{total}}{3600} \rfloor $ $ \text{Minutes} = \lfloor \frac{T_{total} \mod 3600}{60} \rfloor $ $ \text{Seconds} = T_{total} \mod 60 $