From the tags of your query I guess this could also be about TRTH Intraday Summaries (i.e. bars). For most markets data is available 2 hours after market close.
You can check the TRTH Data Coverage Guide. See tab "Data Release Times". Market open times are indicated, as well as the delay after close which in most cases is 120 minutes (there are a few exceptions where you must wait 4 or 5 hours, see column "Embargo").
I just tried (at 12:30 GMT) to get 1 hour bars for 7203.T (Toyota on Tokyo exchange), and got data for today.
am I correct in guessing you are referring to the DSS Intraday Pricing Extraction request ?
If yes, then what you get is based on your permissioning level, on a per venue basis. You can check your permissioning for real-time data in the GUI.
There are several permission levels:
For content available upon subscription.
Note: intraday requests are usually made during market open. But if an intraday request is done outside of market open, then some prices could be null.