The date set for First Trading Date for combination series does not necessarily match with the actual first trading date.

 

[Premise]
-As for First Trading Date in Combination Series, the date of a latest combination series among the first trading date of each leg series is set.
-The combination series is generated according to the generation rule (combination of calendar spreads) for combination series related to each product at the night batch process when the contract (expiration) month for the leg series gets updated.

 

1. Matching case
For example, in the calendar spread series for TOPIX index future "Contract Month September 2018 and September 2019", June 8, 2018 is set as the First Trading Date and it matches with actual first trading date.

 

(Description)
On June 8, 2018, by reaching SQ date, June 2018 series is replaced to September 2018 which becomes near-contract month and September 2019 starts being traded as the far-contract month.
(= First trading date for September 2019 series is June 8, 2018)

 

Moreover, SCO series for calendar spread trading are generated, which are 4 series including September 2018 as the first contract month.
The First Trading Date for the calendar spread series "September 2018 - September 2019" whose fifth contract month is September 2019, will be June 8, 2018 when is the First Trading Date for September 2019 which has the most recent trading start date. This matches the actual First Trading Date.
In addition to the above, there are matching cases for SCO series of JGB futures and overseas indices futures.

 

2. Unmatching cases
For example, in the case of calendar spread series for TOPIX index future "September 2018 and June 2019",
March 9, 2018 is set for the First Trading Date while June 08, 2018 is the actual First Trading Date.

 

(Description)
On June 8, 2018, by reaching SQ date, June 2018 series is replaced to September 2018 which becomes near-contract month.
The June 2019 series has already been trading as the far-contract month, as explained the above.
(= First trading date for June 2019 series is March 9, 2018)

 

The calendar spread series "September 2018 and June 2019" including June 2019 as the fifth contract month is generated and March 09, 2018, being First Trading Date for June 2019 series which is the most recent one, is set as the First Trading Date.

 

3. How to confirm the actual Trading Date in J-GATE?
Since there are cases where First Trading Date does not match as explained in the above #2,
please keep track on the First Trading Date when the combination series is generated at the time of replacement of the contract month.

 

As explained in the premise, since SCO series are automatically generated at the night batch process when contract month is replaced, please retrieve the information for new combination series by DQ126 after online on the first trading date of the series.