This method is deprecated or moved on the latest stable version.
The last existing version (v4.0.2) is shown here.
datetime_format()
public
Get the logging datetime format. Returns nil if the formatter does not support datetime
formatting.
# File activesupport/lib/active_support/core_ext/logger.rb, line 49
def datetime_format
formatter.datetime_format if formatter.respond_to?(:datetime_format)
end