FluentD datetime format doesn't match - regex

Question

This is my FluentD parser config:
<filter format.3.**>
#type parser
format /^\[(?<module>[^\]]+)\] (?<time>.+): (?<msg>.*)$/
time_format %Y-%m-%d %H:%M:%S
key_name log
keep_time_key true
reserve_data false
</filter>
And that's an example log line:
[Macaron] 2017-04-26 16:54:26: Started GET / for 172.20.0.0
In the FluentD error log I'm getting:
2017-04-27 12:01:58 +0000 [warn]: plugin/filter_parser.rb:69:rescue in block in filter_stream: invalid time format: value = 2017-04-27 12:01:58, error_class = ArgumentError, error = invalid strptime format - `%Y-%m-%d %H:%M:%S'
The important part is this:
invalid time format: value = 2017-04-27 12:01:58, error_class = ArgumentError, error = invalid strptime format - `%Y-%m-%d %H:%M:%S'
But I can't see how %Y-%m-%d %H:%M:%S doesn't match 2017-04-27 12:01:58, or why this format would be invalid.
according to this tool it should match

Answer 1

I figured it out, there were some special characters to set colors in the log. Apparently when copy-pasting them into fluentular.herokuapp.com they did not get copied and that's why it worked there:
{"log":"[Macaron] \u001b[1;32m2017-04-27 12:34:07: Completed /node 200 OK in 1.163351ms\u001b[0m\n","stream":"stdout","time":"2017-04-27T12:34:07.953993591Z"}