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In Amazon DynamoDB, Date Time value will be stored as String. When the record is created in Salesforce, DynamoDB will have the value in GMT/UTC. When the record is created in DynamoDB, make sure the value of the Date Time is in GMT/UTC. Blog Post: https://www.infallibletechie.com/2022/12/date-time-field-mapping-in-salesforce-external-object-to-amazon-dynammodb.html