Date filter not parsing this datetime

It seems like this should work, but I'm getting a parsing error.

Sample: 07/08/16-09:25:42.140797
date {
match => [ "datetime", "MM/dd/yy-HH:mm:ss.SSS" ]

What might I be doing wrong or how can I debug the error?

Thanks for the help!

The error message you get,

Failed parsing date from field {:field=>"datetime", :value=>"07/08/16-09:25:42.140797", :exception=>"Invalid format: "07/08/16-09:25:42.140797" is malformed at "797"", :config_parsers=>"MM/dd/yy-HH:mm:ss.SSS", :config_locale=>"default=en_US", :level=>:warn}

hints at what the problem is. Use SSSSSS instead of SSS (but keep in mind that Elasticsearch only keep millisecond resolution, and so will Logstash).

Yep, that seems to be what the deal is. I thought that is would just zero out the remaining timing, but obviously I was wrong. Thanks!