dttm_cvt and tm_cvt do not work when subsecond value more accurate than milliseconds

[yorick-rp]

When getting datetime data from SQL Server, the subsecond value has 7 digits. The code assumes there to be 6 or fewer digits.

To get this working, I truncated the subsecond value to the first 6 digits, so that it has millisecond values.

I changed the last line of dttm_cvt to be:
else: return datetime.datetime(int(x[0:4]),int(x[5:7]),int(x[8:10]),int(x[10:13]),int(x[14:16]),int(x[17:19]),int(x[20:].ljust(6,'0')[0:6]))

Similarly, I changed the last line of tm_cvt to be:
else: return datetime.time(int(x[0:2]),int(x[3:5]),int(x[6:8]),int(x[9:].ljust(6,'0')[0:6]))