Tag Write Timestamp consistently lags actual time of write by about 7 seconds

Ignition
1

I’m writing True to a particular Boolean tag at 10:14:45 and at 10:15:00 (as shown by the CurrentDateTime tag in the System tag provider).

I would have expected the Timestamp of this Boolean tag to change to the same timestamps when I changed the tag to True but they seem to lag the CurrentDateTime timestamp by about 7 seconds consistently. First time it’s True, the Timestamp value is 10:14:38 and the second time it’s True, the Timestamp value is 10:14:53.

Is this expected behavior? Am I missing something here? Attaching a video of my tag writes with the CurrentDateTime shown on top and the Timestamp of the tag shown below.

2

Look for discrepancies between your clock on the designer and the clock of the gateway.

3

They seem to be the same.

I tried running the below in the script console:

designer_time = system.date.now()
gateway_time = system.tag.readBlocking(["[System]Gateway/CurrentDateTime"])[0].value

print "Designer time: {}".format(designer_time)
print "Gateway time:  {}".format(gateway_time)
print "Difference: {}s".format(system.date.secondsBetween(designer_time, gateway_time))

Output:

Designer time: Mon Nov 17 12:02:25 PST 2025
Gateway time:  Mon Nov 17 12:02:25 PST 2025
Difference: 0s

Although this is assuming that running system.date.now() from the Script Console gives the Designer time. Not too sure about this.

What’s interesting is that I just reset the trial mode license on my gateway and now I don’t seem to have this lag. Perhaps the lag is present with a gateway in unlicensed mode?

Going to confirm this when my trial runs out in less than 2 hours

4

Okay I have no lag now with my trial license expired. So that didn’t have an affect.

5

You running your gateway on your machine? If so (and even if not) are you getting clock drift?