Time and Date
Automatic Time and Date Synchronization Method
The automatic synchronization method keeps the device time and date in sync with the time and date of up to two NTP servers or a USB GPS unit.
This method requires to have access to at least one NTP server on the network.
The IP address of the NTP servers can be:
| □ | Obtained automatically using DHCP providing that the DHCP server on the network provides this service. |
| □ | Manually configured. |
An out-of-the-box device, or a device after a "restore factory settings" procedure, is configured for an automatic synchronization using NTP.
Time Source Configuration
Time and Date panel on Device Management page reports the current time source as either NTP, GPS or local.
Select the Time Source in the drop-down list on the Edit Date & Time web page:
| ● | NTP to only use Network Time Protocol and configured NTP servers to define the device local time. |
Attaching a GPS unit has no effect on the system time.
| ● | NTP + GPS uses preferably the locally-attached GPS unit to define the device local time. |
| □ | If no GPS is attached, the system time is aligned on the configured NTP servers. |
To configure GPS only:
- Select NTP + GPS on Edit Date & Time page.
- Uncheck From DHCP option for NTP servers.
- Delete the list of NTP servers in the Network Time Protocol panel of the Device Management page.
| ● | Manual to configure directly the device system time. |
Manual Time and Date Synchronization Method
When the device is configured in the manual method, manually restore the date and time at the next power-up after a long power-off time.
The super-cap protecting the real-time clock device has an autonomy of at least 48 hours.
Time Zones and Daylight Savings Time
Picolo.net HD1 products support time zone and daylight savings time settings. To configure the time zone, the user must provide the appropriate POSIX.1 TZ string describing the UTC offset and, when applicable, the daylight saving rule.
The Daylight Savings Time (DST) can be enabled or disabled on request.
Sample Time Zone rules in POSIX.1 TZ string format
CET-1CEST,M3.5.0/2,M10.5.0/3 applies to Central Europe including Belgium:
| □ | Local time: CET = UTC + 1 hour |
| □ | Daylight Saving Time: CEST = CET + default DST offset of 1 hour |
| □ | DST starts on last Sunday of March at 02:00:00 CET |
| □ | DST ends on last Sunday of October at 03:00:00 CEST |
SGT-8 applies to Singapore:
| □ | Local time: SGT = UTC + 8 hours |
| □ | No DST |
EST+5EDT,M3.2.0/2,M11.1.0/2 applies to US Eastern Time Zone including New York City:
| □ | Local time: EST = UTC - 5 hours |
| □ | Daylight Saving Time: EDT = EST + default DST offset of 1hour |
| □ | DST starts on second Sunday of March at 02:00:00 EST |
| □ | DST ends on first Sunday of November at 02:00:00 EDT |
For a description of the POSIX.1 TZ string syntax, refer to: http://www.gnu.org/software/libc/manual/html_node/TZ-Variable.html