LT Security LTN8600 Series NVR (V2.3.2) - Manual (Page 202)

User Manual of 9600/8600/7700/7600 Series NVR
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14.3 Configuring DST Settings
Steps:
1. Enter the General Settings interface.
Menu >Configuration>General
2. Choose DST Settings tab.
Figure 14. 3 DST Settings Interface
You can check the checkbox before the Auto DST Adjustment item.
Or you can manually check the Enable DST checkbox, and then you choose the date of the DST period.