Try this if you want to have deep analysis based on year,month,date,time etc,
| rex field=_raw "at\s+(?<time>(?<month>\w+)\s(?<date>\d+)\s(?<year>\d+)\s(?<hour>\d+)\S(?<minutes>\d*)(?<clock_set>\w\w))\swith"
It will create time ,month,date,year,hour,minutes,clock_set fields
time as Aug 1 2019 8:01AM , month as Aug, date as 1 , year as 2019 and so on.. Thought this search is costly as it produces more fields, it can be used for analysis/reports etc..
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