import numpy as np


def calc_ds_med(v):
    """
    Calculate the median value of a subgroup by removing any float nulls and
    converting from days to integers
    --------
    :param v: values in column
    :return: median value
    """
    day = np.timedelta64(1, 'D')
    med_val = (v.dropna() / day).astype(int).median().astype(int)
    med_val *= day

    return med_val