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Daylight Savings Time and Network Time Protocol (NTP)

Configuring Daylight Saving Time on your system

You may have to adjust the system time on your Lorex DVR or NVR for Daylight Savings Time (DST). The table below shows the Lorex systems that automatically adjust to DST and the systems that must have their system time manually adjusted.

Consult your system’s owner’s manual for details on how to adjust DST settings (if applicable).

NOTE: Even if your system supports automatic DST, you must configure and enable automatic DST on your system or the time will not be automatically updated.

DVR / NVR Model Automatic DST
netHD LNR200 Series
netHD LNR300 Series
ECO4 LH150 Series
ECO3 LH140 Series
ECO2 LH130 Series
ECO+ LH120 Series
ECO LH110 Series
ECO LH100 Series
LHD100 Series
EDGE3 LH340 Series
EDGE2 LH330 Series
Edge LH300 Series
L23WD Series
Link LH400 Series
Access LH600 Series
SG19LD Series
L20WD / L22WD Series

Some Lorex systems also support Network Time Protocol (NTP), which allows you to synchronize the system with a remote time server over the Internet.

Why is the system's time stamp important?

Your system’s time stamp is crucial when submitting surveillance video as court evidence. It is highly recommended to double-check that your system has the proper time, even if your system supports automatic DST adjustments.

When should I adjust my system clock?

In North America, most cities observe DST.

  • In March: the clock moves one hour forward.
  • In November: the clock moves one hour backward.

The specific date in the month where DST starts and ends varies each year. The table below applies to North America only.

Daylight Saving Time 2013 - 2019

Year DST Begins 2:00am
( + 1hr )
DST Ends 2:00am
( - 1hr )
2013 March 10 November 3
2014 March 9 November 2
2015 March 8 November 1
2016 March 13 November 6
2017 March 12 November 5
2018 March 11 November 4
2019 March 10 November 3


Does updating my system time affect the recordings on my system?

Depending on your model, the system may erase recordings with overlapping time stamps when the system time is updated. This is not an issue when setting the clock forward, but it will occur when setting the clock backward. For example, if the system time is changed at 2:00 AM backwards to 1:00 AM, the system will overwrite video recordings from 1:00-2:00 AM.

Recordings with overlapping timestamps will be erased even on systems that support automatic adjustments for Daylight Savings Time. If it is necessary for you to retain all recordings, it is recommended turn off automatic DST settings and update the time manually. Before manually updating your system time, you must create backups of any recordings that will be overwritten. Check your owner’s manual for instructions on how to backup recordings on your system.

NOTE: DVRs in the LH300 Edge Series will retain recordings with overlapping time stamps when the system time is adjusted backwards.

What is Network Time Protocol (NTP)?

Network Time Protocol (NTP) is a method for synchronizing the system time of computers and other electronic devices to a reference, generally an Internet server. To provide accurate time, NTP uses algorithms to compensate for the delays that normally occur over computer networks and the Internet. In most cases, NTP is capable of providing accurate time within tens of milliseconds over the public Internet1.

Some Lorex DVRs and NVRs are capable of connecting to an NTP server to retrieve and update their system time. If your system supports NTP, it is recommended to enable it, as it will ensure that your system time is accurate and is automatically updated for DST.

Lorex provides a free NTP service for our customers. To use the Lorex NTP service, when setting up NTP on your system, enter for the NTP server address. Please see your system's owner’s manual to determine if your system supports NTP and for instructions on configuring NTP.

NOTE: Your system requires a constant Internet connection to use NTP. If your system is not connected to the Internet, you must configure DST settings separately.


Last Updated: 10/18/2013