Time/Date of order expiration (always expressed in UTC (Universal Time Coordinated, also known as "GMT")

The meaning of expiration is specific to the context where the field is used.

For orders, this is the expiration time of a Good Til Date TimeInForce.

For Quotes - this is the expiration of the quote.

Expiration time is provided across the quote message dialog to control the length of time of the overall quoting process.

For collateral requests, this is the time by which collateral must be assigned.

For collateral assignments, this is the time by which a response to the assignment is expected.