Filtering Date and Time record fields by year

I am working on the Online Academy courses to create an expression that will return a count of vehicles for a specific year.

I am finding it really difficult to work with the date and time functions.  What is the best way to filter a date and time record field by the year?

Any time I try to cast or work with a date time field I get an error.  

With the example below, I get,

"Expression evaluation error at function a!queryRecordType: Unable to find a required instance of TypedValue."

With other functions (date, todate, gmt etc), I get errors saying that the field can't be converted to a date and time with timezone even though the field is a date and time field.

a!queryRecordType(
recordType: 'recordType!{99b0bb09-e2c0-4f75-a70b-26f247e2d095}AA Vehicle',
fields: a!aggregationFields(
groupings: {
a!grouping(
field: 'recordType!{99b0bb09-e2c0-4f75-a70b-26f247e2d095}AA Vehicle.fields.{3f0958cd-8b0d-4071-afdf-fa0902a40002}createdOn',
alias: "yearCreatedOn",
interval: "YEAR"
)
},
measures: {
a!measure(
function: "COUNT",
field: 'recordType!{99b0bb09-e2c0-4f75-a70b-26f247e2d095}AA Vehicle.fields.{3f0958cd-8b0d-4071-afdf-fa0902a40002}createdOn',
alias: "count"
)
}
),
filters: a!queryLogicalExpression(
operator: "AND",
filters: {
a!queryFilter(
field: datetext('recordType!{99b0bb09-e2c0-4f75-a70b-26f247e2d095}AA Vehicle.fields.{3f0958cd-8b0d-4071-afdf-fa0902a40002}createdOn',"MM/DD/YYYY"),
operator: "=",
value: ri!inputYear
)
},
ignoreFiltersWithEmptyValues: true
),
pagingInfo: a!pagingInfo(
startIndex: 1,
batchSize: 100
)
).data