Question

Solve this puzzle :
Here is a list showing the month and a number for each month.
☝January 713131001
☝February 823820602
☝March 531131303
☝ April 542030104
☝May 351131305
☝June 462031006
☝July 471131007
☝ August 683130108
⚡Decipher the logic and find the number for September = ?
The challenge is O P E N for all
Brilliant brain scratching exercise.​

Answer 1

every month is represented by a 9 digit no

in which

first digit shows the no of letters in month

second digit shows month number which is also represented by last 2 digits

I also find this question quite screwed up as the fifth and sixth digits represent no of days in month but it is not applicable in every case