Convert a number representing a time value in the given unit (Default: seconds)
    to a string following the PbsPro convention: "hours:minutes:seconds".

    >>> assert time2pbspro(2, unit="d") == '48:0:0'

def time2pbspro(timeval, unit="s"):
    """
    Convert a number representing a time value in the given unit (Default: seconds)
    to a string following the PbsPro convention: "hours:minutes:seconds".

    >>> assert time2pbspro(2, unit="d") == '48:0:0'
    """
    h, m, s = 3600, 60, 1

    timeval = Time(timeval, unit).to("s")
    hours, minutes = divmod(timeval, h)
    minutes, secs = divmod(minutes, m)

    return "%d:%d:%d" % (hours, minutes, secs)