mw.smw.getPropertyType

The function mw.smw.getPropertyType provides an easy way to get the type of a given property. Note however, that it uses the smw internal property types, not the one you might be used to.

-- Module:SMW
local p = {}

-- Return property type
function p.type(frame)

    if not mw.smw then
        return "mw.smw module not found"
    end

    if frame.args[1] == nil then
        return "no parameter found"
    end
    local pType = mw.smw.getPropertyType( frame.args[1] )

    if pType == nil then
        return "(no values)"
    end

    return pType
end

return p

{{#invoke:smw|type|Modification date}} can be used as it returns a simple string value such as _dat.