Basically, you need to turn those nasty time formats into internal formats, which if I've decoded this correctly will look like this:
| eval time_Uploaded = strptime(Last_uploaded,"%a %b %d %H:%M:%S %:::z %Y")
then compare to your datestamps, which you will have calculated in your dash but I'll put in hard code here.
| where time_Uploaded >= strptime("2020-04-14","%Y-%m-%d")
AND time_Uploaded < strptime("2020-04-17","%Y-%m-%d")
Since these aren't the event _time or _indextime , which splunk can search on using its special time references, it may be easier, dash-wise, to have a time picker kick off a null search that returns the start and end times you want in tokens, so you don't have to deal with "now" or "-1d" or any other funky time formats.
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