ATD - Actual Time of Departure
ATD - Actual Time of Departure
Also called: Actual Departure Time · ATD Vessel · Sailed Date
What is ATD (Actual Time of Departure)?
ATD is the exact date and time a vessel actually left the port. Not when it was scheduled to leave — when it physically sailed. It is a confirmed, real event that has already happened, recorded the moment the ship departs the berth and heads out to sea.
If you have ever tracked a shipment and seen a status update that says "Vessel Sailed" - that timestamp is the ATD.
Think of it this way: When you book a flight, your ticket shows a scheduled departure time of 14:00. But due to a late-arriving aircraft, the plane actually pushes back at 14:45. The 14:00 was the ETD (Estimated Time of Departure). The 14:45 is the ATD — what actually happened.
Why does ATD matter in freight?
In shipping, the schedule is a plan. The ATD is reality.
Vessels get delayed all the time — due to port congestion, bad weather, late cargo, technical issues, or berth unavailability. The scheduled departure (ETD) gives you a plan to work with. The ATD tells you what actually happened — and from that, everything downstream gets recalculated.
Your cargo's entire journey timeline is anchored to the ATD. Once you know the actual departure, you can work out:
When the vessel is likely to arrive at the destination port (ETA recalculates from ATD)
Whether your transit time has changed and by how much
Whether your buyer's deadline is still achievable
Whether you need to send updated documents or notifications to the consignee, customs broker, or buyer
A vessel that departs 3 days late has a ripple effect across your entire supply chain. ATD is the moment that ripple starts, and knowing it precisely lets you respond quickly.
ATD vs. ETD vs. ETA vs. ATA — what is the difference?
These four terms are the core of shipment tracking and planning. They are easy to confuse because they all look similar. Here is a clear breakdown:
ETD (Estimated Time of Departure) — The planned, scheduled departure date and time. This is what the carrier publishes in advance. It can change. It is a prediction, not a fact.
ATD (Actual Time of Departure) — The real departure date and time. Confirmed after the vessel has sailed. It cannot change — it is a recorded fact.
ETA (Estimated Time of Arrival) — The predicted arrival date and time at the destination port. Calculated based on ATD plus the transit time. Updated whenever ATD or sailing conditions change.
ATA (Actual Time of Arrival) — The real arrival date and time at the destination port. Confirmed after the vessel has berthed. The equivalent of ATD but at the other end of the journey.
A simple example for a shipment from Chennai to Rotterdam:
ETD Chennai: 1st June (what was planned)
ATD Chennai: 4th June (what actually happened — vessel delayed 3 days)
ETA Rotterdam: Revised from 22nd June to 25th June (recalculated from ATD)
ATA Rotterdam: 26th June (what actually happened at destination)
Each of these four data points tells you something different. ATD is the anchor — once you have it, everything else downstream becomes more accurate.
What causes a vessel to depart later than the ETD?
Delays between ETD and ATD are very common in ocean freight. Reasons include:
Port congestion — When too many vessels are waiting for a berth, your ship has to wait its turn before it can load and sail.
Late cargo — If a significant amount of cargo booked on the vessel has not arrived at the terminal in time, the carrier may hold the vessel briefly to wait for it.
Weather conditions — Storms, cyclones, or extreme sea conditions can delay departure for safety reasons.
Equipment or technical issues — Mechanical problems with the vessel, crane breakdowns at the terminal, or port equipment failures.
Customs or documentation holds — If cargo on the vessel is flagged by port authorities or customs, the vessel may be held until the issue is resolved.
Berth unavailability — The terminal may not have a free berth slot available at the scheduled time, pushing the vessel to wait at anchor.
A small delay of 12 to 24 hours is very common and usually has minimal impact. Delays of 3 to 7 days or more start to cause real downstream problems.
How does ATD affect your shipment practically?
Let us say you are an importer in Germany buying garments from India. Your buyer has a retail launch date of July 15th and you need the goods in your warehouse by July 10th to allow for customs clearance and delivery.
The vessel ETD from JNPT (Mumbai) was June 5th with a 25-day transit time — giving you an ETA of June 30th. Plenty of buffer.
But the vessel actually sailed on June 9th (ATD). Transit time is still 25 days. Your new ETA is now July 4th. After 3 days for customs clearance, goods arrive at your warehouse July 7th. You still make your July 10th deadline — but with just 3 days to spare instead of 10.
If the ATD had been June 12th instead, you would have missed your deadline entirely. That is why ATD is not just a tracking data point — it is a decision-making trigger.
Where can you find the ATD for your shipment?
There are several ways to track ATD:
Shipping line tracking portal — Most major carriers (Maersk, MSC, CMA CGM, Evergreen etc.) have online tracking tools where you enter your Bill of Lading number or container number and see live status updates including ATD.
Freight forwarder updates — Your forwarder should proactively notify you once the vessel has sailed, confirming ATD and revised ETA.
Freight management platforms — Tools like Cargoez consolidate tracking across carriers and give you real-time visibility of ATD, ATA, and all milestones in one place without having to log into multiple carrier portals separately.
Vessel tracking tools — Platforms like MarineTraffic or Vessel Finder show real-time vessel positions and can confirm when a ship departed a port.
Why does ATD matter to you as a shipper or importer?
It triggers your downstream planning. The moment ATD is confirmed, you can recalculate ETA, update your customs broker, notify your warehouse, and alert your buyer if there is a delay.
It is the basis for transit time calculation. Carriers quote transit times from departure to arrival. Without knowing the actual departure, you cannot accurately predict when your goods will arrive.
It protects you in disputes. If there is a dispute about delivery delays — with your supplier, buyer, or insurer — ATD is an objective, verifiable timestamp. It clearly shows when the vessel actually sailed, separate from what was originally promised.
It affects your Letter of Credit deadlines. In trade finance, Letters of Credit (LCs) often specify a latest shipment date. ATD is the date used to determine whether the shipment was made within the LC validity. If ATD falls after the LC's latest shipment date, the LC may be non-compliant — a serious financial and legal issue.
It helps you manage customer expectations. Knowing ATD early lets you proactively communicate realistic delivery dates to your buyers instead of being caught off guard when delays are discovered late.
Conclusion
ATD is a confirmed past event — it records when the vessel actually sailed
Different from ETD which is the planned, estimated departure time
All downstream milestones (ETA, ATA) are recalculated from ATD
Vessel delays between ETD and ATD are extremely common in ocean freight
ATD is critical for Letter of Credit compliance in trade finance
Visible on carrier tracking portals, freight platforms, and vessel tracking tools
Frequently asked questions
1. Can ATD be earlier than ETD?
Yes. Vessels occasionally depart ahead of schedule if all cargo is loaded early, port congestion clears faster than expected, or weather windows are favourable. An early ATD means an earlier ETA — which is usually good news, but can sometimes catch an importer off guard if they are not ready for early arrival.
2. Does ATD affect demurrage or detention free time?
In some cases yes. Certain carriers and trade lanes calculate free time at the destination from the vessel's ATD or ATA rather than from a fixed calendar date. If a vessel arrives early due to an early ATD, your free time window may begin sooner than expected. Always confirm how free time is triggered with your forwarder.
3. Is ATD the same as the Bill of Lading date?
Not always. The Bill of Lading (BL) date is typically the date the cargo was loaded on board or the date the BL was issued — which is usually close to but not always identical to the ATD. For on-board Bills of Lading, the on-board date should match or be very close to ATD. For Letter of Credit purposes, the on-board BL date is what matters — confirm this with your bank and forwarder.
4. What if the carrier does not update ATD on their portal?
This happens occasionally, especially with smaller carriers or on less-trafficked routes. In this case, contact your freight forwarder directly — they have direct carrier communication and access to sailing confirmations that may not be reflected on public portals immediately.
5. How is ATD different from cut-off time?
Cut-off time is the deadline by which your cargo must be at the terminal before the vessel sails. ATD is when the vessel actually sails. These are different points in time — the cut-off typically happens 24 to 48 hours before ATD to give the terminal time to load all containers.