I have in this format:

```
(Pdb) aa = time.strptime("2015-02-28 14:19:05.512", "%Y-%m-%d %H:%M:%S.%f")
(Pdb) aa
time.struct_time(tm_year=2015, tm_mon=2, tm_mday=28, tm_hour=14, tm_min=19, tm_sec=5, tm_wday=5, tm_yday=59, tm_isdst=-1)

```

How can I convert it into a string `'2015-02-28T14:19:05'`