ETD and ETA are estimates of departure and arrival. ATD and ATA report the corresponding actual events. Each still needs a location, a leg and a source: a transhipment ETA is not the final-port ETA, and vessel arrival is not container discharge or delivery to your warehouse. Read the event before using a date in a receiving plan.
A date-reading guide for a shipment already being coordinated
The buying or logistics owner gathers the booking confirmation, tracking record and authorised replies; the booking party clarifies transport information, while the receiving team checks destination requirements. The output is a traceable record of the date, event, source and next action. This guide does not forecast a sailing or determine a contractual remedy. Use the broader freight-booking checklist for booking preparation.
1. Identify the port, leg and event first
A message saying “ETA Thursday” leaves important questions open. Record the shipment reference, vessel and voyage where applicable, port or inland point, event name, date, time zone and source. Ask the booking party when the zone is missing. Do not silently turn every displayed time into China time or compare a transhipment arrival with a final-port arrival.
Here, ETD means departure in an ocean-shipping context. Check the actual system definition if a label is used differently. Some systems show ETS or ATS; those product-specific labels are not a universal carrier naming rule. Keep the event linked to your shipment rather than relying on a vessel name alone.
2. Separate the four date types
| Field | Usual meaning | What it does not establish alone |
|---|---|---|
| ETD | Estimated Time of Departure for the stated leg; the estimate can change | Actual departure or loading of your particular cargo |
| ETA | Estimated Time of Arrival at the stated point; the estimate can change | Actual arrival, discharge, release or warehouse delivery |
| ATD | Actual Time of Departure reported for the corresponding event | That a particular container was aboard, from a vessel record alone |
| ATA | Actual Time of Arrival reported for the corresponding event | That your cargo is discharged, collectable or received by the buyer |
On smaller screens, scroll within the table to view all three columns.
An actual date still needs an event source and a connection to your cargo. Do not fill in ATD or ATA because an estimate has passed. Mark an actual record as unavailable when you have not obtained it. Vessel arrival and container discharge are separate events; do not assign a universal gap between them.
3. Keep the baseline and each supported revision
Maersk’s help page directs customers to the latest booking confirmation, online booking or app for the latest ETD. When a date changes, record which version you read, when you read it and the leg it describes. If sources disagree, give the difference to the booking party to resolve rather than selecting the more convenient value.
A useful working record contains: shipment reference; location and event; estimate or actual; date and time zone; source/version; reading time; unresolved question; owner and review trigger. The buying owner keeps the baseline and revisions. Recheck after a booking update, vessel/voyage change, transhipment change or new actual event. An unagreed follow-up time remains unagreed.
4. Test the wording with a fictional example
Fictional example: the first confirmation estimated Tuesday departure, a newer confirmation says Thursday, and no actual departure record has been obtained. A useful update is: “The latest booking confirmation estimates Thursday departure for this leg. Actual departure remains unconfirmed; the destination estimate and downstream arrangements are being checked.” Do not convert it to “sailed Thursday” or treat a final-port ETA as the date your warehouse receives the goods.
If your receiving need is a particular day, first name the receiving location and required milestone. Let logistics and receiving colleagues check the subsequent moves and collection conditions. Do not add a fixed number of days to an ETA and promise delivery. Use backward delivery planning for the complete milestone plan and the delay-recovery guide when a delay needs handling.
5. Hand over a date with its limits and next action
Tell the receiving team the latest supported date and event, whether it is estimated or actual, which steps remain unconfirmed, and who will check them. An authorised person makes any delivery commitment against the actual arrangements; this guide does not provide one.
For destination status, use the cargo-release checklist. Check free-time conditions separately rather than treating an ETA or ATA as a universal fee-clock trigger. A complete record improves traceability; it does not prove timely delivery, permission to collect or absence of charges.
Sources and boundaries
Maersk’s ETD help page supports checking the latest booking information. Its 2022 Indonesia notice supports basic ETD/ATD terminology, not a universal current cut-off timetable. Dockflow’s date and milestone documentation distinguishes estimates, actuals and event locations; its interface labels apply to that product. Checked 21 October 2026. The record fields and fictional scenario are CZ Overseas methods, not carrier rules or customer outcomes.
Buyers can now ask which event a date describes, retain the reason for a schedule revision and keep a receiving decision separate from a vessel estimate.
Frequently asked questions
Does reaching the ETA mean I can collect my cargo?
No. Check the location and event behind that estimate, then confirm the relevant arrival, discharge, release, customs and terminal collection requirements with the actual parties handling the shipment.
Does an ATD prove that my container was loaded?
An ATD reports actual departure for the relevant leg. Verify the vessel, voyage, port and connection to your cargo. A vessel departure record on its own does not prove that a particular container was loaded.
Should I replace the original ETA whenever it changes?
Keep the original plan and supported revisions, each with its source, reading time and event. Use the latest applicable estimate for coordination while retaining history. An updated estimate does not become an actual event.