# enum StartDateTimeType (v202602)

**Service** [AdRuleService](https://developers.google.com/ad-manager/api/reference/v202602/AdRuleService.StartDateTimeType) **ForecastService** [LineItemCreativeAssociationService](https://developers.google.com/ad-manager/api/reference/v202602/LineItemCreativeAssociationService.StartDateTimeType) [LineItemService](https://developers.google.com/ad-manager/api/reference/v202602/LineItemService.StartDateTimeType) [LiveStreamEventService](https://developers.google.com/ad-manager/api/reference/v202602/LiveStreamEventService.StartDateTimeType) **Dependencies** [LineItemSummary](https://developers.google.com/ad-manager/api/reference/v202602/ForecastService.LineItemSummary) ▼ **StartDateTimeType**

Specifies the start type to use for an entity with a start date time field.
For example, a [LineItem](https://developers.google.com/ad-manager/api/reference/v202602/ForecastService.LineItem) or [LineItemCreativeAssociation](https://developers.google.com/ad-manager/api/reference/v202602/LineItemCreativeAssociationService.LineItemCreativeAssociation).

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Namespace
:
    `https://www.google.com/apis/ads/publisher/v202602`

| Enumeration | Description |
|---|---|
| `USE_START_DATE_TIME` | Use the value in [startDateTime](https://developers.google.com/ad-manager/api/reference/v202602/ForecastService.StartDateTimeType#startDateTime). |
| `IMMEDIATELY` | The entity will start serving immediately. [startDateTime](https://developers.google.com/ad-manager/api/reference/v202602/ForecastService.StartDateTimeType#startDateTime) in the request is ignored and will be set to the current time. Additionally, [startDateTimeType](https://developers.google.com/ad-manager/api/reference/v202602/ForecastService.StartDateTimeType#startDateTimeType) will be set to [StartDateTimeType.USE_START_DATE_TIME](https://developers.google.com/ad-manager/api/reference/v202602/ForecastService.StartDateTimeType#USE_START_DATE_TIME). |
| `ONE_HOUR_FROM_NOW` | The entity will start serving one hour from now. [startDateTime](https://developers.google.com/ad-manager/api/reference/v202602/ForecastService.StartDateTimeType#startDateTime) in the request is ignored and will be set to one hour from the current time. Additionally, [startDateTimeType](https://developers.google.com/ad-manager/api/reference/v202602/ForecastService.StartDateTimeType#startDateTimeType) will be set to [StartDateTimeType.USE_START_DATE_TIME](https://developers.google.com/ad-manager/api/reference/v202602/ForecastService.StartDateTimeType#USE_START_DATE_TIME). |
| `UNKNOWN` | The value returned if the actual value is not exposed by the requested API version. |