0 length field in time string

[Rodrick Brown]

Anyone know why I'm getting the following error when trying to parse the following string is there a better method to use? 

#57=2010081708240065 - sample string passed to fmt_datetime
 
def fmt_datetime(tag57):
    tag57   = tag57[3:len(tag57)]
    year    = int ( tag57[0:4] )
    mon     = int ( tag57[4:6] )
    day     = int ( tag57[6:8])
    hour    = int ( tag57[8:10] )
    min     = int ( tag57[10:12] )
    sec     = int ( tag57[12:14] )
    msec    = int ( tag57[14:16] )

    dt      = datetime.datetime(year,mon,day,hour,min,sec)
    return '{:%Y-%m-%d %H:%M:%S}'.format(dt)

  File "./delta_delay.py", line 27, in fmt_datetime
    return '{:%Y-%m-%d %H:%M:%S}'.format(dt)
ValueError: zero length field name in format
 


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