Date and Time

Purpose

Use the Date and Time form to set the 3300 ICP system date and time. The form supports synchronization of system date and time and automatic adjustment for Daylight Savings Time based on the zoneinfo Zoneinfo is a collaborative database of the world's time zones, and is primarily intended for use with computer programs and operating systems. Zoneinfo is also sometimes referred to as the Olson or the tz database.database and Network Time Protocol (NTP) servers.

Conditions

For the MXe Server, which receives its date and time from MSL, the only modifiable field in this form is the time zone. Refer to the MSL Installation and Administration Guide for information on setting up NTP for the MXe Server.
If the date and time synchronization is enabled, the WriteDateTime command is disabled and fails with an error when the command is used.
When you enable date and time synchronization, you must specify the DNS address of an NTP server.
When you disable date and time synchronization, you must specify system date and time manually.
The NTP Server address is ignored when a database from another controller type is restored to the MXe Server since it gets its time and date from MSL. However, SDS will propagate the address to the other controller types if an SDS synch is initiated from the MXe Server.
When the time/date of the switch has been changed, you must reset Bandwidth Management Statistics, using the BWM Statistics Reset command.
Phones display the local time of the host controller local time, not the local time of the phone which may be a different time zone.
Note: The CX, CXi, CX II, and CXi II, MXe, and AX do not perform averaging of time samples it collects from the NTP server (averaging helps to improve accuracy). Because of this, and the longer network delays characteristic of the Internet, it is preferable to use an NTP server within the customer's corporate LAN. If you must use an internet-based server, choose one that is closet to your location. Use the following link to locate a suitable server: http://support.microsoft.com/kb/262680.

IMPORTANT: To ensure that the system adjusts for Daylight Savings Time (DST), avoid setting the system time within an hour of the DST transition.

Field Descriptions

Parameter	Description	Default Value
Synchronize	Enables or disables system date and time synchronization with the NTP server. This field is read-only for the MXe Server.	Enabled for the MXe Server. Disabled for all other controller types.
Synchronization with NTP Server
NTP Server DNS	Specifies the DNS address of an NTP server for reference by the system clock. If the system fails to connect to the NTP server, a maintenance log is generated. The SNTP client then polls the server at regular intervals until the connection is made. If failure to connect continues, a new log is generated for every 10 failed intervals. This field is read-only for the MXe Server.	As set by MSL for MXe Server; blank for all other controller types.
Time Zone
Time Zone	Specifies the time zone for the system. Note: Time zones include an offset (typically +1) for daylight saving time (DST) if DST is observed in that region. The UTC and GMT options (which are the same) do not include the DST offset. If you choose one of these options, you will have to manually adjust for DST. Note: The time zone information is Linux-based, which uses the opposite convention that Windows uses to specify GMT-based offsets. In Windows, a positive (+) offset adds time relative to GMT; whereas, in Linux it subtracts it. So GMT+5 in Linux is actually five hours earlier than the GMT time making it, for example, 7:00 AM by the 3300 ICP system clock, when it's 12:00 GMT. In Windows, when it's 12:00 GMT, the clock in your PC shows 5:00 PM (or 17:00).	Blank
Change Date and Time Manually
Date (dd-mm-yyyy)	Specifies system date manually. This field is read-only for the MXe Server and is set by MSL	As set by MSL for MXe Server; Blank for all other controller types.
Time (hh:mm:ss)	Specifies system time manually. This field is read-only for the MXe Server and is set by MSL.	As set by MSL for MXe Server; Blank for all other controller types.