@cpetterborg, thanks for reminding of sed, following replace should also do the trick
| makeresults
| eval Time="Jun 28 11:50:23 2017"
| eval Time=replace(Time,"(\w{3}\s\d{2})(\s\d{2}:\d{2}:\d{2})(\s\d{4})","\1\3\2")
Basically June 28 is extracted as 1st Capturing group 11:50:23 as 2nd and 2017 as 3rd. Then replace is used to format them in correct sequence i.e. 1, 3, 2. Output field will remain String Date. Refer to the documentation: http://docs.splunk.com/Documentation/Splunk/latest/SearchReference/TextFunctions#Basic_example_4
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