import datetime



def after(rec, scan):    
    path = get_exec_pars().group+"/TimeIOC"
    if rec.index==0:
        create_dataset(path, 's')
    nanos = bpm6a.timestampNanos
    dt = datetime.datetime.fromtimestamp(nanos/1e9)
    time_str = str(dt).ljust(26,'0') + str(int(nanos % 1e3)).zfill(3)
    append_dataset(path, time_str , type = 's')

mscan(bpm6a, bpm6a, -1, 1000.0, after_read = after)
#mscan(bpm6b, bpm6b, 5)

#tscan(bpm6a, b5, 2.0)