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Im hoping someone could help me please. I am trying to retrieve time and date from the Sim800L and I am coming short. I have a Sim800L here and I am communicating with it successfully over the Arduino IDE. I have used the following AT commands as suggested online with the following results.

AT+CCLK?

+CCLK: "04/01/01,03:59:51+00"

OK

AT+CLTS=1

OK

AT&W

OK

AT+CLTS?

+CLTS: 1

OK

After restarting, the date and time however is not set to network time. The network is a national carrier and should be able to do this.

AT+CCLK?

+CCLK: "04/01/01,03:59:51+00"

OK

Any ideas? Thank you

Misha
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  • Did you already try use [this lib](https://github.com/cristiansteib/Sim800l/blob/master/Sim800l.cpp)? – Esdras Xavier Mar 06 '19 at 12:56
  • yes. I am moving away from that library given the nature of my project. But all functions I have tried using in that library work, except the RTC functions. Not sure if I am calling the function in the right way though. is this correct: Sim800l.RTCtime(); ? – Misha Mar 06 '19 at 13:46
  • I have done the following checks: Ive taken the Sim800L simcard and put it into a phone. Then used the phone to check that auto-update-time on my phone works and it does. So the simcard is fine. I have also put my phone simcard into the Sim800L module and also could not get the correct time on the Sim800L module. – Misha Mar 07 '19 at 15:26
  • Can it be that the module works fine except for getting time? – Misha Mar 07 '19 at 15:27

3 Answers3

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I found the same trouble. in this page embedded world i Found something that works for me. it is add the following instruction AT&W

Read current time (You can see that the time is not right):

AT+CCLK?

+CCLK: "04/01/01,00:14:12+22"

OK

Enable auto network time sync :

AT+CLTS=1

OK

Check if value is set :

AT+CLTS?

+CLTS: 1

OK

Save the setting to permanent memory so that module enables sync on restart also :

AT&W

OK

Restart the module and check time :

AT+CCLK?

+CCLK: "18/06/21,12:00:21+22"

OK

and it is all.

Community
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Jacobo Córdova
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You do correct but

Base on "SIM800 Series_AT Command Manual_V1.09" Edited on 2015-08-03 in page 154 in "6.2.12 AT+CLTS Get Local Timestamp" section

"Support for this Command will be network dependent."

Change your network provider

AliReza
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In the UK, "AT+CCLK?" usually works (the network sets this time) IF using a network-branded-SIM (eg. EE or O2 branded). However for SOME MVNO-SIMs (Mobile Virtual Network Operators SIMS) "AT+CCLK?" does NOT work (even where the same network-branded-SIM does).

Under these cases (for my SIM800L), if you need a valid time (for example so you can send a GPRS-email with a valid time-stamp), you have to manually set the time using: AT+CCLK="21/10/15,18:55:00+04"

Rob
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