What is your goal?
I want to send a Slack notification every hour when a HubSpot contact’s last CV is updated. To do this, the scenario should trigger only when the last CV timestamp is within the past hour since the previous run.
What is the problem?
I need to filter contacts based on their last CV time within the past hour, but my filter condition isn’t working. Using addHours(now; -1) results in an error, and I’m not sure how to correctly specify the filter.
What have you tried so far?
I attempted to add a filter in the Make scenario using the expression addHours(now; -1) to capture contacts whose last CV value is within the past hour. However, Make returned an error when processing this expression. I haven’t found an alternative filter setup that works yet.
HubSpot sends timestamps in ms, so you must convert them first. Use a filter like: parse Date(last_cv) > add Hours(now; -1). This is the correct way in Make to check updates within the past hour.
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Thanks for the guidance! I tried building a filter using parseDate(…) and addHours(now; -1) as you suggested. In my case, I replaced last_cv with the “Recent Conversion Date” property (see attached screenshot). Unfortunately, the filter still throws an error when I try to save it.
It seems the filter UI isn’t accepting the expression, or I might be missing something in the syntax. The Last CV/Recent Conversion Date is a date/time property in HubSpot, so I assumed parsing and comparing it should work. Are there any additional steps I need to take to convert the timestamp or apply the function correctly?
Any further advice would be greatly appreciated!
Hey! Try to use datetime operators instead of Time operators. Used to work for me, also without the parse theoretically.

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You don’t just put it inside a parseDate(), you have to actually tell it what the format is.
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Thanks a lot, that was exactly it!
Switching the filter from Time operators to Datetime operators did the trick.
Now the filter with Recent Conversion Date > addHours(now; -1) works without any more 400 errors and my “last 1 hour conversions only” scenario is running perfectly again.
Really appreciate you sharing this tip 
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Happy to hear it! Keep on automating!