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UE3:ParticleModuleStoreSpawnTime (UDK)

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UDK Object >> ParticleModule >> ParticleModuleStoreSpawnTimeBase >> ParticleModuleStoreSpawnTime
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Engine

With this you can store the exact time a particle system was spawned. This is useful for additional effects based off the time when the parent effect's particles were spawned. You need to the spawn time because the RelativeTime is for when that specific particle system will die. Due to having random durations you are not guarenteed for that value to represent the order in which the individual particles were spawned.