Item filter is not working

[girirajnish]

I want to filter the data on the basis of time but not found any way in the documentation provided. While I am trying any of the following way getting "requests.exceptions.HTTPError: 422 Client Error: Unprocessable Entity" as error.

connect

unity = Unity(host,user,passwd)
a= datetime.datetime.now() - datetime.timedelta(hours=1)
b=a.strftime("%Y-%m-%dT%H")
fil ='creationTime LK "{}%"'.format(b)
print(fil)
#code to collect disk data into a file
data= unity.event(item_filter=fil)

Or

connect

unity = Unity(host,user,passwd)
a= datetime.datetime.now() - datetime.timedelta(hours=1)
b=a.strftime("%Y-%m-%dT%H:%M:%SZ")
fil ='creationTime GE"{}"'.format(b)
print(fil)
#code to collect disk data into a file
data= unity.event(item_filter=fil)