The expression "on or about" or similar will be interpreted as a stipulation … five calendar days before until five calendar days after the specified date, both start and end dates included. On or about May 10? The words "to", "until", "till", “from” and “between” when used to determine a period of shipment include the date or dates mentioned, and the words “before” and "after“ exclude the date mentioned. Shipment to be made before 12/31/07? Shipment to be made after 12/01/07? Shipment to be made until 12/31/07? The words “from” and "after" when used to determine a maturity date exclude the date mentioned.
ISBP681(2):The applicant bears the risk of any ambiguity in its instructions to issue or amend a credit. Unless expressly stated otherwise, a request to issue or amend a credit authorizes an issuing bank to supplement or develop the terms in a manner necessary or desirable to permit the use of the credit.