Version 7.0 139 Mediant 3000
User's Manual 12. Date and Time
12.3 Configuring the Time Zone
You can configure the time zone in which the device is deployed. This is referred to as the
Coordinated Universal Time (UTC) time offset and defines how many hours the device is
from Greenwich Mean Time (GMT). For example, Germany Berlin is one hour ahead of
GMT (UTC/GMT is +1 hour) and therefore, you would configure the offset to "1". USA New
York is five hours behind GMT (UTC/GMT offset is -5 hours) and therefore, the offset is a
minus value and configured as "-5".
 To configure the time zone (UTC offset):
1. Open the Time and Date page (Configuration tab > System menu > Time And
Date), and then scroll down to the 'Time Zone' group:
Figure 12-4: UTC Offset on Time and Date Page
2. In the 'UTC Offset' fields (NTPServerUTCOffset), configure the time offset in relation
to the UTC. For example, if your region is GMT +1 (an hour ahead), enter "1" in the
'Hours' field.
3. Click Submit; the updated time is displayed in the 'UTC Time' read-only field and the
'Local Time' fields.
12.4 Configuring Daylight Saving Time
You can apply daylight saving time (DST) to the date and time of the device. DST defines a
date range in the year (summer) where the time is brought forward so that people can
experience more daylight. DST applies an offset of up to 60 minutes (default) to the local
time. For example, Germany Berlin has DST from 30 March to 26 October, where the time
is brought forward by an hour (e.g., 02:00 to 03:00 on 30 March). Therefore, you would
configure the DST offset to 60 minutes (one hour).
 To configure DST using the Web interface:
1. Open the Time and Date page (Configuration tab > System menu > Time And
Date), and then scroll down to the 'Time Zone' group:
Figure 12-5: Configuring DST
2. From the 'Daylight Saving Time' (DayLightSavingTimeEnable) drop-down list, select
Enable
3. From the 'DST Mode' drop-down list, select the range type for configuring the start and
end dates for DST:
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