About the timing of fetching in DeviceTimeAns

End Devices (Nodes)
1

I get the time from the gateway reply command DeviceTimeAns as shown in the picture.

First of all, is the time correct? If so, how do I convert to UTC? I don’t understand the conversion algorithm.

Time=1663310463.629
image

2

Please format your post correctly, all text, code etc. you can post in between </>

So you want to convert a epoch to UCT?

3

Sorry, this is my bad habit of Posting. Yes, I want to convert an epoch to UCT.

4

Fix your bad habit please :slight_smile: we are volunteers helping, help us to help you.

It is the nanoseconds from Thursday, January 1, 1970 12:00:00 AM time, so just add the nanoseconds.

But be aware some might express it in seconds, milliseconds, microseconds and nanoseconds.

5

No, it’s 1663316472

Google comes up with sooooo many hits for this.

And frankly, the Unix time format is like breathing, it’s just known, so please please consider using Google first

1 Like
6

When I use the DEVICE_TIME_REQ command, in SRV_MAC_DEVICE_TIME_ANS I read that the returned GPS time is 1669186181 and the converted UTC time is Nov 27, 2032 06:49:23. Obviously this is the wrong value. Why does this happen?

7

Is this time generated by the gateway’s GPS or by the server?

8

I provided an answer to the exact same question under About the timing of fetching in DeviceTimeAns · Discussion #1388 · Lora-net/LoRaMac-node · GitHub

9

@orange_zouxiangcheng, please do not double post, even cross-site - the number of people proactively helping in the LoRaWAN space is quite small so it’s a duplication of resources.

10

I’m sorry, I was in a bit of a hurry because of the project schedule. It won’t happen again.