system.date.addWeeks Variable Question

Ignition
,
1

Im making a pm scheduler using the following script:

<today = system.date.now()
WeeksFromToday = system.date.addWeeks(today, 2)
system.tag.write("PM/DateCalc", WeeksFromToday)>

If I put a tag in for the "2" to make the week counter variable it gives me a:
Traceback (most recent call last):

File "event:actionPerformed", line 2, in

TypeError: addWeeks(): 2nd arg can't be coerced to int

Ignition v7.9.1 (b2017012511)
Java: Oracle Corporation 1.8.0_411

The variable im trying to use is an INT4

2

Are you reading the tag or just putting in a tag path? You will need to read the tag.

Something like this:

today = system.date.now()
weeks = system.tag.readBlocking(["week_tag_to_use"])[0].value
WeeksFromToday = system.date.addWeeks(today, weeks)
system.tag.write("PM/DateCalc", WeeksFromToday)
3 Likes
3

Thanks for the reply, are reading blocks just for strings or lists.

4

Block means it blocks the gui thread until the operation is complete, and it returns a list of values because it accepts multiple tag paths at a time.

5

It's not reading blocks, but blocking the thread while reading.

See the manual: https://docs.inductiveautomation.com/docs/8.1/appendix/scripting-functions/system-tag/system-tag-readBlocking

1 Like
6

Im still on 7.9, I tired the read function but it returns the same error.

7

In the future, you should mark the post with that tag. I'm taking care of it for you. This post also belongs in the Ignition category, not general discussion.

1 Like
8

In that case:

today = system.date.now()
weeks = system.tag.read("week_tag_to_use").value
WeeksFromToday = system.date.addWeeks(today, weeks)
system.tag.write("PM/DateCalc", WeeksFromToday)
2 Likes
9

You're awesome, it was the .value I was missing.

10

No sweat.

For 7.9 the manual on this is here: system.tag.read | Ignition User Manual

A tag read will return a QualifiedValue:

QualifiedValue - A qualified value. This object has three sub-members: value, quality, and timestamp.