The “Shipped On Board Date” is a notation added by the Bill of Lading issuer that confirms the cargo has been loaded on board. This notation should be created at origin by the carrier or the carrier’s agent, and should indicate the name of the vessel on which goods have been shipped. “Shipped On Board” Bills of Lading give greater security to importers and importers’ banks.

装船日期是提单签发人添加的批注，用以确认货物已装船。承运人或承运人代理应在出运港添加该批注，其中应载明运输货物的船舶名称。对于进口方或进口方银行而言，“已装船”提单更具有安全性。

Many Letters of Credit require a “Shipped On Board Ocean Bill of Lading.” That requirement means that the Bill of Lading must be original and display a “Shipped On Board Date” in order for the Letter of Credit to be satisfied. This notation is usually typed within the body of the Bill of Lading, and is shown along with the “On Board Date.”

许多信用证都会要求提供“已装船提单”。也就是说，必须提供正本提单，且提单须载明“装船日期”。该批注通常印在提单正文内，与“装船日期”一起显示。

On the other hand, a “Bill of Lading Date” is the date on which the Bill of Lading was issued. The “Shipped On Board Date” and “Bill of Lading Date” are two different dates, and may not be the same. The “Bill of Lading Date” is different from the “Shipped On Board Date” as the container may have been loaded on board the ship on a different date, while the Bill of Lading was issued to the customer at a later date.

另一方面，“提单日期”指的是提单的签发日期。“提单日期”与“装船日期”属于两个不同的日期，可能不是同一日期。“提单日期”与“装船日期”不同的原因在于，集装箱可能已经于某一日装船，而提单则是在稍晚日期签发的。

For example, if a container was shipped on board on April 2, 2018, its Bill of Lading date cannot be earlier than the “Shipped On Board Date” since a Bill of Lading can only be issued after a container has been physically shipped on board. The “Bill of Lading Date” has to be on, or after, the “Shipped On Board Date.”

比如，如果集装箱于2018年4月2日装船，那么提单日期不可能早于“装船日期”，因为只能在集装箱实际装上船后签发提单。“提单日期”要么与“装船日期”一致，要么晚于“装船日期”。

If the shipping document does not display a “Shipped on Board Date,” the “Bill of Lading Date” is considered the “Shipped On Board Date.” A Bill of Lading cannot be issued without a “Shipped On Board Date.”

如果运输单据未载明“装船日期”，则“提单日期”视为“装船日期”。只有载明“装船日期”才能签发提单。

来源：

https://www.morethanshipping.com/the-differences-between-shipped-on-board-dates-and-bill-of-lading-dates/