Configuring Daylight Saving

Last Updated : Aug 28, 2026 |
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  1. Log in to the web interface.
  2. In the navigation pane, click Date & Time.
  3. In the Daylight Saving area, configure the following:
    • Daylight Saving Mode: Select one of the following options:
      • No daylight saving time
      • Manual daylight savings activated (time set to DSTOFFSET)
      • Automatic daylight savings adjustment (as specified by DSTSTART and DSTSTOP) (Default)
    • DST Offset: Specifies the time in hours between the standard time and daylight savings time.
      Select one of the following options:
      • 0
      • 1 hour (default)
      • 2 hours
      From software version 4.1.0 and later, the phone supports the following values:
      • -1
      • 0
      • 1 hour (default)
      • 2 hours
    • DST Start: Specifies when to apply the offset for daylight savings time. The value format is odddmmmht or Dmmmht, where:
      • o represents a one-character ordinal adjective. For example, 1 for first, 2 for second, 3 for third, 4 for fourth, or L for last.
      • D represents 1 or 2 ASCII digits or characters representing the date of the month.
      • ddd represents three characters containing the English abbreviation for the day of the week. For example, Sun for Sunday, Mon for Monday.
      • mmm represents a three-character English abbreviation for the month. For example, Jan for January, Feb for February.
      • h represents a one-numeric digit representing the time to adjust hAM (0h00 in military format).
        The valid values of h are from 0 through 9.
      • t represents one character for the time zone to which the changes are applied. For example, “L” for local time or “U” for Universal Time.
    • DST Stop: Specifies when to stop the offset for daylight saving time. The value format must be either odddmmmht or Dmmmht, where:
      • o represents a one-character ordinal adjective. For example, 1 for first, 2 for second, 3 for third, 4 for fourth, or L for last.
      • D represents 1 or 2 ASCII digits or characters representing the date of the month.
      • ddd represents three characters containing the English abbreviation for the day of the week. For example, Sun for Sunday, Mon for Monday, etc.
      • mmm represents a three-character English abbreviation for the month. For example, Jan for January, Feb for February, etc.
      • h represents a one-numeric digit representing the time to adjust hAM (0h00 in military format).
        The valid values of h are from 0 through 9.
      • t represents one character for the time zone to which the changes are applied. For example, “L” for local time or “U” for Universal Time.
  4. Click Save to save the settings.