AI-generated Key Takeaways
- 
          StartDateTimeType specifies how an entity with a start date time field, such as a LineItem or LineItemCreativeAssociation, will begin serving. 
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          The available options include using a specified startDateTime value, starting immediately, or starting one hour from the current time. 
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          When using IMMEDIATELYorONE_HOUR_FROM_NOW, the provided startDateTime in the request is ignored and the startDateTimeType is set toUSE_START_DATE_TIMEupon setting the start time.
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          The UNKNOWNenumeration is returned if the actual value is not exposed by the requested API version.
Specifies the start type to use for an entity with a start date time field. For example, a LineItem or LineItemCreativeAssociation.
- Namespace
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               https://www.google.com/apis/ads/publisher/v202502
| Enumeration | Description | 
|---|---|
| USE_START_DATE_TIME | Use the value in startDateTime. | 
| IMMEDIATELY | The entity will start serving immediately. startDateTime in the request is ignored and will be set to the current time. Additionally, startDateTimeType will be set to StartDateTimeType.USE_START_DATE_TIME. | 
| ONE_HOUR_FROM_NOW | The entity will start serving one hour from now. startDateTime in the request is ignored and will be set to one hour from the current time. Additionally, startDateTimeType will be set to StartDateTimeType.USE_START_DATE_TIME. | 
| UNKNOWN | The value returned if the actual value is not exposed by the requested API version. |