This works

Select Current_Date + Cast(1, Interval Day)

This causes an error "ElevateDB Error #1011 An error occurred with the value 2021-04-21 (A conversion error occurred with the value)"

Select Cast(1, Interval Day) + Current_Date

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 Comments and Workarounds

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The workaround is as-described by Kevin - the issue was that the expression evaluator was not properly handling a date added to a day-time interval (or a year-month interval, either).

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 Resolution

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Fixed Problem on 4/22/2021 in version 2.34 build 3

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 Products Affected

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ElevateDB Additional Software and Utilities
ElevateDB DAC Client-Server
ElevateDB DAC Client-Server with Source
ElevateDB DAC Standard
ElevateDB DAC Standard with Source
ElevateDB DAC Trial
ElevateDB LCL Standard with Source
ElevateDB PHP Standard
ElevateDB PHP Standard with Source
ElevateDB PHP Trial
ElevateDB VCL Client-Server
ElevateDB VCL Client-Server with Source
ElevateDB VCL Standard
ElevateDB VCL Standard with Source
ElevateDB VCL Trial