Setting values with specific timestamps

[psysak]

Hey guys, I'm sure this has been asked somewhere in here before. Is there a way I can create a dashboard page which would allow me to set the value of a specified point but also pass a timestamp? We have several parameters which come from the electrical company which change every few months and then need to applied to calculations. I need to be able to allow end users to open a dashboard, select the point and basically specify something like May 2019. The system would take that value and apply it to the point as of May 1 2019 00:00:00.000

[CraigWeb]

What about using scheduled events to trigger a script to change a data points value?
Surely there is some set pattern to the dates that the value should change?
You could still have a dashboard where they set a virtual point that will be used in their calculation.

[phildunlap]

Hi psysak,

There are a few ways you could go about it,

1. Build a UI widget that POSTs to the /rest/v2/point-values endpoint.

[
  {
     "xid": "DP_Num_Example",
     "timestamp": 1557250438657,
     "dataType": "NUMERIC",
     "value": 123.456
  }
]

2. Encode the date and rate information into one or more points, then trigger a scripting data source which "Saves historic" to .set(value, timestamp) to the appropriate points. I may set an alphanumeric to 52.13~1557250438657 which is a context point that updates the context of a script which simply splits the string on ~ and turns it back to numbers.

Neither of these methods would cause point events to run currently (no websocket notification of the new value, , but the value would be available for recalculating meta point histories, for instance.