From http://linux.die.net/man/3/strftime
%a- The abbreviated weekday name (Sun)%A- The full weekday name (Sunday)%b- The abbreviated month name (Jan)%B- The full month name (January)%d- Day of the month (01..31)%e- Day of the month without leading 0 (1..31)%g- Year in YY (00-99`)