This message is of concern for every Investor/RT subscriber running a 15.1.25 (or earlier) version and facing an "DTN server clock" error message on March 9th 2026
Dear Investor/RT subscriber,
The date for the most recent US Daylight Saving Time switch (which took place on March 8, 2026) is missing in one of the Investor/RT configuration file. This did result in the error message mentionned above, together with incorrect time stamp for downloads from historical DTN MA servers (performed after the DST switch, i.e. from Sunday morning onwards), with IQ feed subscribers being also impacted.
Consequently, on their first connection from March 8th, 2026 onwards, Investor/RT users faced the message "CLOCK 1 HOUR OFFSET from DTN server / Check computer clock" or other similar error message.
To fix the issue right away,
1st step) please stop the Investor/RT data feed (Data > Stop Data) and delete any data that may have been downloaded since the overnight market session open
This can be done by using the "Delete Historical Data" option in the Data Management section of the "Data > Database wizard" menu (see screeshot below)
Select the option "Delete Data from" and select the period with incorrect data (typically starting on March 8th market open at 6pm Eastern)
2nd step) Locate the holidays.txt file (which is holding the DST calandar) in the following directory
C:> ProgramFiles> Linnsoft> InvestoRT> Admin
And replace it with the updated holidays.txt file available for download here
3rd step) Restart Investor/RT. The Auto backfill feature should then fill any missing data with the right time stamp. (If needed proceed with a manual Data download)
Contact us if you face any issue with this process
Note: if you have a recent restore point dba file, an alternitive (and even simpler) way to proceed is as follow:
a) Shutdown I/RT - download the most recent holidays.txt file and replace the current file
b) Revert to this restore point file (created last week, before the DST switch on Sunday)
c) Restart I/RT - The autobackfill feature will fill up any necessary data gap with the right time stamps
Please note that Investor/RT 16.1 beta release users are not impacted by this issue.
Reminder: The Daylight Saving Time support webpage is located here. This is mainly of concern for US based users trading EU markets or European traders dealing with US futures)
Best regards,
Linn Software Support Team
