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[Reuben B.]

With DATETIME variables, a common requirement is to add a number of minutes to a DATETIME.
 
Developers occasionally get stuck and the reason I believe is that Implicit Type conversions occasionally get you into bad habits.  Sometimes you need to take a step back, use 3 lines of code instead of 1, then you can see the issue, and then see what the 1 line of code solution is.
 
With DATETIME addition, that can mean making sure that what you are attempting to add to the DATETIME is an INTERVAL, not a STRING.  It should be DATETIME + INTERVAL = DATETIME
 
Read more here https://4js.com/ask-reuben/ig-120/

[Reuben B.]

Rene reminded me about the UNITS operator which could shorten my example even further so I added a small paragraph and included that in the code example.

Reuben