I have a list of daily measurements taken on given dates, where the measurements follow the dates:

```
lis = {"a", "b", "October", "01", "2021", "c", "d", "October", "1", "2021","e", "October", "2", "2021", "f"}

```

I would like to organize these measurements as discrete list members as follows:

```
res = {{DateObject[{2021,10,1}],"c","d"},{DateObject[{2021,10,1}],"e"},{DateObject[{2021,10,2}],"f"}}

```

Thanks for any ideas!