User Manual of Digital Video Recorder 
 
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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. 4 DST Settings Interface 
 
You can check    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.