import datetime


def after(rec, scan):    
    cache = bpm6a.takeTimestamped()
    path = get_exec_pars().group+"/time"
    pathpc = get_exec_pars().group+"/timepc"
    if rec.index==0:
        create_dataset(path, 's')
        create_dataset(pathpc, 's')
    time_str = str(datetime.datetime.fromtimestamp(cache.timestampNanos/1e9))
    append_dataset(path, time_str , type = 's')
    time_str = str(datetime.datetime.fromtimestamp(time.time()))
    append_dataset(pathpc, time_str , type = 's')


mscan(bpm6a, bpm6a, -1, 10.0, after_read = after)