date time string in ISO 8601 format (or rather, a subset thereof), or null. Allowed are the following formats: "YYYY-MM-DD" and "YYY-MM-DDTHH:MMZ" (with 'T' a separator and 'Z' indicating UTC/Zulu time). This field should be set via the GST_PACKAGE_RELEASE_DATETIME preprocessor macro.
Set releaseDatetime field.