4.1.2 HEADER Part of a syslog Packet
...
The TIMESTAMP field is the local time and is in the format of "Mmm dd
   hh:mm:ss" (without the quote marks) where:

         Mmm is the English language abbreviation for the month of the
         year with the first character in uppercase and the other two
         characters in lowercase.  The following are the only acceptable
         values:

         Jan, Feb, Mar, Apr, May, Jun, Jul, Aug, Sep, Oct, Nov, Dec

         dd is the day of the month.  If the day of the month is less
         than 10, then it MUST be represented as a space and then the
         number.  For example, the 7th day of August would be
         represented as "Aug  7", with two spaces between the "g" and
         the "7".
...