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we used to set RTC date and time using command 25-03/ 25-01 on NEO I products. 

However, the above commands are not working for NEO II readers, such as VP5300/VP6300. PCI policy, the RTC can only be set at manufacturer. If the readers are working in a different timezoe, you will have to modify tag DFEF43 to set to local TZ and daylight saving information.

here is the definition of tag DFEF43.

Byte1: +/-, indicate current timezone is ahead or behind UTC.
Byte2: HH, hours of the time difference with UTC.

Byte3: MM, minutes of the time difference with UTC.

Byte4: Flag for daylight saving, set 1 to indicate daylight saving enabled.


for example, I want the reader to have local time +8 UTC time and no daylight saving. I send 04-00, data DFEF43042b080000. Noticed, the change will only affects transaction time. You can find the new 9A and 9F21 is changed. 

here is my example setting transaction time. Noticed, the change will only affects transaction time. You can find the new 9A and 9F21 is changed. 

16:46:35.480 OUT: 5669564f74656368320004000008dfef43042b0800007277
16:46:35.481 IN: 5669564f74656368320004000000ae16

16:46:55.391 OUT: 5669564f746563683200250600004c5d

16:46:55.393 IN: 5669564f74656368320025000006190717235316d68c

16:56:09.192 OUT: 5669564f746563683200024000161e9c01009f02060000000001009f0306000000000000e6e2

16:56:15.570 IN: 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