I wanted to use %d{yyMM}/%d{dd} and it didn't work for the same reason, but %{yyMM/dd} works fine. No idea if it applies to your case.

I don't understand why only the first date format gets considered for rollover. IMHO it's a bug, while taking the union of all date specifiers would be just right.

On Thu, Oct 12, 2017 at 9:26 PM, QOS.CH (JIRA) <noreply-jira@qos.ch> wrote:

Sean Nelson created LOGBACK-1346:
------------------------------------

Summary: Set daily rollovers without full date together in the fileNamePattern
Key: LOGBACK-1346
URL: https://jira.qos.ch/browse/LOGBACK-1346
Project: logback
Issue Type: Improvement
Reporter: Sean Nelson
Assignee: Logback dev list
Priority: Minor

I want to set up a daily rollover with the following fileNamePattern:
* /path/to/rolling_logs/%d\{yyyy-MM,aux}/%d\{dd}/log_name.%i.log

When I try this, I get an error explaining, '*T**he date format in FileNamePattern will result in collisions in the names of archived log files*.' This format would not actually result in naming collisions. The only workaround I've found is to include the full date as part of the filename, e.g.:
* /path/to/rolling_logs/%d\{yyyy-MM,aux}/%d\{dd,aux}/log_name.%d.%i.log

If there is some other workaround that I'm not aware of, please advise.

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