How to get Date/Time from GSM network?

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Dan Groswirth - 08 Jan 2006 15:54 GMT

I would like to get Date/Time from GSM network by a cellular mode host
controller for
updating an internal RTC (Real Time Clock).
Is any body knows how to "ask" the network for this info?
Thanks
Danny

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Earl F. Parrish - 04 Feb 2006 11:41 GMT

>I would like to get Date/Time from GSM network by a cellular mode
>host
[quoted text clipped - 3 lines]
> Thanks
> Danny

If you press an elevator button several times, it will come faster.
It is the same fallacy as multiple posting of the same message. Why
not use the Network Time Protocol over the Internet and the
appropriate client software? Cellular phones only show time to the
minute so one could lose up to fifty-nine seconds that way.

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Earl F. Parrish

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Name - 04 Feb 2006 14:34 GMT

>>I would like to get Date/Time from GSM network by a cellular mode host
>> controller for
[quoted text clipped - 8 lines]
> software? Cellular phones only show time to the minute so one could lose
> up to fifty-nine seconds that way.

Hi, no prererence on NITZ over NTP but the fact that phones only show time
in minutes does not mean that the network would not provide better
granularity. Time is actually provided with a granularity of seconds.

Don't know if it would be possible to get this info via the AT-interface to
your application.

10.5.3.9 Time Zone and Time
The purpose of the timezone part of this information element is to encode
the offset between universal time and local time in steps of 15 minutes.

The purpose of the time part of this information element is to encode the
universal time at which this information element may have been sent by the
network.

The Time Zone and Time information element is coded as shown in figure
10.5.84/3GPP TS 24.008 and table 10.5.97/3GPP TS 24.008.

The Time Zone and Time is a type 3 information element with a length of 8
octets.

8
7
6
5
4
3
2
1

Time Zone and Time IEI
octet 1

Year

octet 2

Month

octet 3

Day

octet 4

Hour

octet 5

Minute

octet 6

Second

octet 7

Time zone

octet 8

Figure 10.5.84/3GPP TS 24.008 Time Zone and Time information element

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