The Expiration Rule defines the rule for calculating the official expiration date of futures contract. In combination with Futures Symbol Format, it is used by Rollover Management to automatically build the symbol of a FUTURES instrument. Its use is mandatory ONLY in futures with Rollover Management enabled (continuous futures).
Expiration Rule and Futures Symbol Format are used ONLY for FUTURES instruments and ONLY if Rollover Management is enabled in the instrument configuration.Expiration Rule defines the rule for calculating the official expiration date of futures contract. Futures Symbol Format instead contains rules for constructing the futures symbol and specifically the month and year of expiration.
We also recommend you read Rollover documentation carefully. It will help you better understand how the Futures Symbol Format is used and where.
If the Expiration Rule or Futures Symbol Format are not set correctly, the futures symbol will be incorrect and NOT recognizable from the data-feed. Consequently you will NOT receive any data and you will NOT be able to trade.The instrument symbol MUST always be the same as the symbol used by data-feed to identify the instrument. If you have any doubts, please refer to the data-feed official platform and/or ask their support.
There are many preconfigured Expiration Rules in Overcharts. If the correct Expiration Rule for your futures instrument is not listed (very rare), create a new one.
You can access Expiration-Rule list in one of the following ways:
1. From Overcharts main window > Instruments Tab > Expiration Rules button
2. From Overcharts main window > Instruments menu > Expiration Rules
To create/modify an Expiration-Rule:
1. Access Expiration-Rule list
2. Select the Expiration-Rule to edit and press Edit button, or press New button to create a new Expiration-Rule. Warning: You can ONLY modify an Expiration-Rule created by you. It is not possible to directly modify a preconfigured Expiration Rule. To modify a preconfigured Expiration Rule you must first copy it by pressing Copy button and then modify it.
3. Set or change the following properties:
Name: Expiration-Rule unique name
Set the expiration rule by appropriately combining available fields:
We suggest you view preconfigured Expiration Rules to better understand how to combine available fields and get general rule for calculating the official expiry date of futures contracts (on months defined in Futures Symbol Format).
ES (S&P 500) futures expires on the third Friday of March, June, September and December. To get general rule, set available fields as follows:
Expiration-Rule must be set in the configuration of a FUTURES instrument with Rollover Management enabled.