Introduction
Date calculation is one of the most confusing areas in documentary credits.
A single LC transaction may contain several different dates:
shipment date;
latest date of shipment;
presentation date;
expiry date;
draft date;
acceptance date;
maturity date; and
crystallisation date.
These dates perform different functions. A common CAIIB mistake is to apply the rule for one date to another.
For example, the 21-calendar-day rule relates to presentation of documents containing specified original transport documents. It is not the usance period. Similarly, the five-banking-day period relates to bank examination of documents and is not an additional period available to the beneficiary for presentation.
Maturity calculations are governed by the tenor stated in the credit or draft and the applicable UCP 600 and ISBP principles. Crystallisation, on the other hand, is an exchange and recovery mechanism applied when a foreign-currency liability remains unpaid.
For numerical questions, the safest approach is:
Identify the event → identify the governing period → identify the base date → apply the correct counting rule.
Learning Objectives
After studying this topic, you should be able to:
Determine the latest permissible date for presentation under UCP 600.
Distinguish presentation period, expiry date and document-examination period.
Identify the correct base date for different types of usance.
Calculate maturity according to ISBP 821 date-counting principles.
Understand the treatment of maturity falling on a non-banking day.
Apply the current FEDAI framework for crystallisation of unpaid import bills.
Important Terms
Term | Simple Meaning | CAIIB Relevance |
|---|---|---|
Presentation | Delivery of documents under the credit to the issuing bank or nominated bank | Determines whether documents were submitted in time |
Presentation Period | Period within which stipulated documents must be presented | Often tested with shipment and expiry dates |
Usance | Credit period allowed before payment becomes due | Determines maturity |
Tenor | Wording that defines when payment is due | Identifies the base date for maturity |
Maturity Date | Date on which payment under a usance undertaking becomes due | Major numerical area |
Crystallisation | Conversion of unpaid foreign-currency liability into rupee liability | Important for import LC and exchange-rate questions |
Presentation Period under UCP 600
UCP 600 Article 14(c) provides an important default rule.
Where a presentation includes one or more original transport documents subject to Articles 19 to 25, presentation must be made:
not later than 21 calendar days after the date of shipment; and
in any event, not later than the expiry date of the credit.
Therefore, two limits may operate at the same time:
the presentation-period limit; and
the LC expiry-date limit.
The beneficiary must satisfy both.
If the credit itself specifies a shorter presentation period, that requirement must also be observed.
Presentation Deadline
Latest Presentation Date = Earlier of (Shipment Date + Permitted Presentation Period) or LC Expiry Date
This identifies the final permissible presentation date after considering both the presentation period and credit expiry.
Refer to the Formula Section for a detailed explanation, variables, and solved examples.
How Are the Days Counted?
Under ISBP 821, when the words “from” or “after” are used for a presentation period following a shipment date, document date or event, the base date is excluded.
Therefore, counting starts on the following calendar day.
Calendar Days vs Banking Days
This distinction is essential.
The default Article 14(c) presentation period is 21 calendar days.
It does not mean 21 banking days.
Weekends and holidays therefore remain part of the calendar-day count. Whether an extension is available at the final deadline is a separate issue governed by Article 29.
Five Banking Days Are Different
UCP 600 Article 14(b) gives a nominated bank acting on its nomination, confirming bank and issuing bank a maximum of five banking days following the day of presentation to determine whether a presentation is complying.
That period belongs to the bank for examination.
It is not:
part of the beneficiary's 21-day presentation period;
an extension of the expiry date; or
a grace period for late documents.
When the Last Presentation Day Is a Bank Holiday
Under UCP 600 Article 29, if the expiry date or last day for presentation falls on a day when the bank is closed for reasons other than those covered by Article 36, the deadline is extended to the first following banking day.
However, the latest shipment date is not extended merely because the bank is closed.
This distinction is important:
Date | Can Article 29 Extension Apply? |
|---|---|
Expiry date | Yes, where Article 29 conditions are satisfied |
Last day for presentation | Yes |
Latest shipment date | No |
When Does the 21-Day Default Rule Apply?
The Article 14(c) default applies to a presentation containing one or more original transport documents governed by Articles 19–25.
ISBP 821 clarifies that a mere copy of such a transport document is not subject to the default 21-calendar-day period unless the credit establishes an applicable presentation-period requirement.
Similarly, documents such as a cargo receipt, delivery order or forwarder's certificate that do not constitute transport documents under Articles 19–25 are not automatically subject to Article 14(c)'s default period.
Determining the Correct Shipment Date
Before calculating a presentation period or maturity linked to shipment, identify the correct shipment date from the applicable transport document.
For a bill of lading, the date of issue is normally treated as the shipment date unless a separate dated on-board notation appears. In that situation, the dated on-board notation determines the shipment date.
For an air transport document, the issue date is normally treated as the shipment date unless a specific notation states the actual shipment date.
Using the wrong shipment date can therefore make both the presentation-period and maturity calculation incorrect.
Multiple Transport Documents and Presentation Period
ISBP 821 contains important rules where multiple transport documents with different shipment dates form part of one presentation.
For example, with multiple bills of lading:
where partial shipment is prohibited and the documents represent shipment on the same vessel and same journey, the latest relevant shipment date is used for calculating the presentation period;
where partial shipment is allowed and multiple sets covering different shipments form part of one presentation, the earliest shipment date is used for calculating the presentation period.
This is a high-value numerical trap because the correct date depends on the nature of the shipments.
Understanding Usance
A usance LC allows payment at a future determinable date instead of immediate payment at sight.
UCP 600 recognises availability by methods including:
sight payment;
deferred payment;
acceptance; and
negotiation.
The tenor may be linked to different events.
Common examples include:
60 days after sight;
90 days after bill of lading date;
60 days after shipment;
90 days from invoice date; or
payment on a stated calendar date.
The first task in any maturity numerical is therefore to identify the base event.
“From” and “After” in Maturity Calculations
For maturity purposes, UCP 600 and ISBP 821 treat the words “from” and “after” in the same basic way: the date mentioned is excluded from the calculation.
Thus, counting begins on the day following the relevant date.
This applies to expressions such as:
60 days after bill of lading date;
90 days from shipment date; or
30 days after invoice date.
Maturity Based on a Fixed Base Date
Maturity Date = Relevant Base Date + Usance Period
The base date itself is excluded when the tenor uses “from” or “after”.
Refer to the Formula Section for a detailed explanation, variables, and solved examples.
“Days After Bill of Lading Date”
Where the tenor is linked to the bill of lading date, identifying the correct B/L date is crucial.
ISBP 821 provides that when a credit calls for a draft, for example, at 60 days after the bill of lading date, the on-board date is treated as the bill of lading date for maturity purposes, even where it differs from the document's issue date.
Therefore, a numerical question may deliberately provide:
B/L issue date; and
a different on-board date.
Do not automatically use the issue date.
“Days After Sight”
“After sight” is conceptually different from “after shipment”.
ISBP 821 states that for a complying presentation with a draft drawn, for example, at 60 days sight, maturity is established 60 days after the day of presentation to the drawee bank.
For a non-complying presentation, the maturity basis can depend on the circumstances surrounding refusal and acceptance of waiver. ISBP 821 provides specific rules for such situations.
For CAIIB, the main distinction is:
After sight is linked to presentation/acceptance mechanics, whereas after B/L date or after shipment is linked to an objectively identifiable document or shipment date.
Deferred Payment Credits
A deferred payment LC may not require a bill of exchange.
However, ISBP 821 states that the maturity-calculation principles used for drafts also apply to a credit available by deferred payment, and in some cases negotiation, even when no draft is required.
Therefore, absence of a physical draft does not mean that maturity rules become irrelevant.
Multiple Shipment Dates for Maturity
Maturity questions involving several on-board dates require careful reading.
ISBP 821 provides different treatment depending on the facts.
For example:
where one B/L shows unloading and reloading and relevant on-board dates at different permitted ports, the earliest applicable on-board date may be used;
where goods are loaded on the same vessel from more than one permitted port, the latest relevant on-board date is used;
where more than one set of bills of lading is presented under one draft, the latest on-board date is used for maturity calculation.
The lesson is important: do not mechanically choose the earliest or latest date. First identify the shipment structure.
When Maturity Falls on a Non-Banking Day
ISBP 821 provides that payment is due in immediately available funds on the due date if that date is a banking day at the place of payment.
If the due date is a non-banking day, payment becomes due on the first following banking day.
Additional grace days or remittance time are not automatically added to the agreed maturity date.
Crystallisation of Import Bills under LC
Crystallisation is different from maturity.
Maturity tells us when payment becomes due.
Crystallisation converts an unpaid foreign-currency liability into a rupee liability according to the applicable bank policy and exchange-rate rule.
This distinction is important because an unpaid bill does not become crystallised merely because a learner applies an old memorised number of days.
Current FEDAI Position
FEDAI's website currently identifies its Rules, 10th Edition, as updated up to 30 May 2025, including the April 2024 amendments.
Under FEDAI Rule 3.3, unpaid foreign-currency import bills drawn under letters of credit are to be crystallised according to the stated policy of the bank.
This means there is no single universal FEDAI crystallisation day that should automatically be assumed for every bank.
Exchange Rate for Import-Bill Crystallisation
Under the current FEDAI Rule 3.1:
where a hedge contract is in place, the applicable rate is as per the hedge contract;
where there is no hedge contract, the prevailing Bill Selling rate applies to retirement as well as crystallisation of the import bill.
Crystallised Rupee Liability
Crystallised Rupee Liability = Foreign Currency Liability × Applicable Exchange Rate
For a direct quotation expressed as rupees per unit of foreign currency, this converts the unpaid foreign-currency amount into its rupee liability.
Refer to the Formula Section for a detailed explanation, variables, and solved examples.
The resulting rupee liability may then carry applicable interest and charges according to the bank's policy and contractual terms.
Maturity vs Crystallisation
Basis | Maturity | Crystallisation |
|---|---|---|
Meaning | Date payment becomes due | Conversion of unpaid foreign-currency liability into rupees |
Main Driver | LC tenor and applicable date rule | Bank's stated crystallisation policy |
Exchange Rate Required? | Not merely to determine the date | Yes, for conversion into rupees |
Can Both Dates Be Same? | Possible depending on policy | Not automatically |
Main Exam Trap | Wrong base date | Applying an outdated universal crystallisation period |
Practical Banking Application
A banker dealing with a usance import LC should maintain a clear sequence.
Step 1: Establish Presentation Validity
Check:
shipment date;
permitted presentation period;
presentation date; and
LC expiry date.
Step 2: Establish Maturity
Read the exact tenor and identify whether it is linked to:
sight;
shipment;
bill of lading date;
another document date; or
a fixed date.
Apply the correct counting convention.
Step 3: Diary the Due Date
If the calculated maturity falls on a non-banking day, apply the ISBP treatment for payment on the first following banking day.
Step 4: Monitor Payment
The applicant should retire or fund the bill according to the bank's arrangements.
Step 5: Apply Crystallisation Policy if Unpaid
If the foreign-currency import bill remains unpaid, apply the bank's stated crystallisation policy and the applicable FEDAI exchange-rate rule.
This sequence prevents the common error of treating presentation, maturity and crystallisation as one continuous date calculation.
CAIIB Exam Focus
Remember these high-value rules:
The Article 14(c) default presentation period is 21 calendar days, not banking days.
Presentation containing an applicable original transport document must also be made no later than LC expiry.
The shipment date is excluded when calculating a period stated as days “from” or “after” shipment.
Five banking days relate to document examination by the bank, not beneficiary presentation.
“From” and “after” exclude the base date when calculating maturity.
For B/L-linked maturity, the relevant on-board date may determine the base date.
“After sight” and “after B/L date” do not use the same base event.
Deferred-payment maturity can be calculated even when no draft is required.
If maturity falls on a non-banking day, payment is due on the first following banking day.
Current FEDAI rules make import-LC crystallisation dependent on the bank's stated policy.
For import-bill crystallisation, use the hedge-contract rate where applicable; otherwise, the prevailing Bill Selling rate applies under the current FEDAI rule.
Common Exam Traps
Trap 1: Counting the Shipment Date as Day 1
Incorrect where the period is stated as days “from” or “after” shipment.
The base date is excluded.
Trap 2: Treating 21 Days as Banking Days
Incorrect.
Article 14(c) specifies calendar days.
Trap 3: Ignoring the LC Expiry Date
Incorrect.
Even if the calculated 21-day period ends later, presentation cannot exceed the credit expiry date unless an applicable UCP extension operates.
Trap 4: Adding Five Examination Days to Presentation Time
Incorrect.
The five banking days belong to the bank's examination process.
Trap 5: Using B/L Issue Date Without Checking On-Board Date
Incorrect in cases where the applicable rule makes the dated on-board notation the shipment date.
Trap 6: Treating “60 Days Sight” as “60 Days After Shipment”
Incorrect.
The two tenors use different base events.
Trap 7: Automatically Adding Grace Days to Maturity
Incorrect under ISBP 821. The agreed due date is not automatically extended by grace days or remittance time.
Trap 8: Assuming a Universal Crystallisation Day
Incorrect under the current FEDAI framework for import bills under LCs. Crystallisation is according to the stated policy of the bank.
Memory Technique
Use P-U-M-C:
P – Presentation: Shipment date → permitted presentation period → expiry
U – Usance: Identify the tenor and its base event
M – Maturity: Exclude the base date where required and count the tenor
C – Crystallisation: Apply bank policy and applicable exchange rate if unpaid
This sequence helps keep four different date concepts separate in CAIIB numerical questions.