def vtime2obspytime( vtime ):
    """
    Converts valve time string to UTCdatetime (an obspy object).
    
    Parameters
    ----------
    vtime: list
        List of strings of valve times (yyyymmddHHMMSS).
        
    Outputs
    ---------
    obspytime: list
        List of UTCdatetime objects.
    """
    obspytime = [nowtime.strptime(nowtime, '%Y%m%d%H%M%S') for nowtime in vtime] 
    return obspytime