<title> <META NAME="description" CONTENT="AquaCalc LLC / JBS Instruments specializes in stream flow measurement devices like the AquaCalc that are used in the field of hydrology."> <META NAME="keywords" CONTENT="jbs instruments aquacalc aquacount stream flow measurement water discharge current meter hydrology usgs"> </title>

Year 2020 / 1920 Problem

Last edited 5/28/2020


AquaCalc 5000 Advanced firmware version H8c and earlier shows the year as “1920” instead of “2020” on the AquaCalc 5000 Output CSV file. This problem only appears in the output header under “DATE”.


It does not affect the quality or value of the transect velocity or discharge value. It only affects the first two digits of the  year in the header.



AquaCalc 5000 (tm)  by JBS Instruments
Firmware Version AQCUSH8c (c)1995-2000

        GAGE ID#  ,0
            DATE  ,01/30/1920
        TRANSECT  ,07
        USER ID#  ,0
        SH BEGIN  ,0.00
          SH END  ,0.00
        GH BEGIN  ,0.00
          GH END  ,0.00


We are working on a solution to this problem (May 2020)


We last worked on new firmware for the AquaCalc 5000 in the year 2000 to handle the Year 2000 changeover. We have not altered the firmware since.


This bug / problem is related to the Year 2000 change. It appears that the programmer at the time only made provision through 2019 for years ending in 00-19. These have been translated to “2000 – 2019” anything before or after remains a “19xx”. We didn’t know that. So when you enter “19” for the year, the AquaCalc 5000 reports 2019. But when you enter “20” for the year, it reports 1920.


We have working on a fix to this problem. Currently this involves an new version of the Advanced firmware. To update the firmware in the AquaCalc 5000, and new computer chip or “EPROM” must be installed.


Please contact Customer Support or look on our website in the future.



AquaCalc 5000 Year Problem

AquaCalc LLC. telephone +1.916.372.0534 e-mail: sales@aquacalc.com

Need Accessories or Cables?

We have replacement parts and cables for the AquaCalc line of stream flow computers including the Digital Pygmy Magnetic Head retro fit your old Pygmy Current Meter with a new digital magnetic sensor.

Find Accessories and Cables here.

Contact Us