iio_gts_find_itime_by_sel
itime_old = iio_gts_find_itime_by_sel(gts, old_time_sel);
itime_new = iio_gts_find_itime_by_sel(gts, new_time_sel);
time = iio_gts_find_itime_by_sel(gts, sel);
int_time = iio_gts_find_itime_by_sel(&data->gts, int_time_sel);
itime = iio_gts_find_itime_by_sel(gts, sel);