IMessageExpiration Property

The UTC time (in milliseconds, from midnight, January 1, 1970 UTC) when the message is to expire. The expiration time is carried in the message when set to a non-zero value. Expiration time is not included when this value is set to zero.

Setting this property has no effect if the TimeToLive is set in the same message. The message expiration time is carried to clients that receive the message unmodified and does not affect the life cycle of the message. Set TimeToLive to a positive value to enforce message expiry in the network. When TimeToLive has a positive value, the Expiration is never carried in the message (defaulting to zero). However, it may be calculated and retrieved if the session property CalculateMessageExpiration is set to true.

if message Expiration time is not set in the message and the session property CalculateMessageExpiration is set to true, the Expiration time is calculated based on the message's TimeToLive. When enabled, the Expiration time retrieved will be the UTC time when the message is sent plus the message's TimeToLive. The Expiration time for received messages will be the UTC time when the message was received plus the TimeToLive of the message at the time it was received.

long Expiration { get; set; }