Depending on series, Expiration date can be or cannot be retrieved.
Expiration date (SQ date) is to be set in [expiration_date_n] of series code for normal series.
On the other hand, Last Trading Date of the nearest contract month is to be set for SCO series.

 

[Expiration Date]
Expiration Date is the day to be set contract month for each products.
For instance, expiration date for Nikkei 225 Futures is the second Friday of each contract month 
Also it is called SQ date.

 

[Last trading day]
Last trading day of each products for Index Futures (exclude Dividend Index Futures), Index options, and Securities options is the second Friday of each month (if it falls upon an OSE non-business day, it will be advanced) 
though it depends on the products.