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A. To make the transaction time accurately reflect your local time, you can add or modify the value to the DFEF43 tag in your Group 0 settings.

1. Download and install the .NET SDK Demo from Universal Library for Visual Studio - Home.

2. Retrieve the reader's current date and time by sending the Get RTC Date and Time (25-06) command with no data (see below screenshot).  

3. 
   

   Please be aware that the date & time stored in the reader is the UTC.

4. Define the 4-byte value of the DFEF43 tag based on the definition of the tag below:

   • Byte1: +/-, indicates the current timezone is ahead or behind UTC.
   • Byte2: HH, hours of the time difference between the local and UTC.
   • Byte3: MM, minutes of the time difference between the actual local time in the reader with UTC.
   • Byte4: Flag for daylight saving, set 1 to indicate daylight saving enabled.

   For example, if a device is located in California (PST), which is 7 hours behind the UTC and currently in Daylight Saving Time, and if the time retrieved from the reader is five minutes ahead of the actual local time, the four-byte value of DFEF43 should be 2D 07 05 01 where:

   • 2D is the hex code for the "-".
   • 07 is the hour that we are behind the UTC.
   • 05 is the minutes that the reader is currently ahead of the actual local time.
   • 01 indicates that the summer saving is on.
     
     
5. Add Tag DF EF 43 04 2D 07 05 01 in Group 0 settings by sending the Set Configuration (04-00) command with data DF EF 43 04 2D 07 05 01 if Tag DFEF43 doesn't exist in your current group 0 or if you want to modify the value of the existing DFEF43 tag in Group 0.
6. Finally, perform a transaction test to verify the transaction time (Tag 9F21) is reflecting the correct local time.  

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