A historical-rate record should contain more than one number. Keep the requested date, actual provider date, source currency, target currency, quotation direction, data source and calculation result. Weekend and holiday lookups require special attention because the most recent valid business-day rate may be returned.
Requested date versus actual provider date
The requested date is the date you asked for. The actual provider date is the date attached to the returned rate. They can differ because of weekends, holidays or missing data. A report should retain the actual provider date and, when relevant, the original requested date.
Do not reverse the pair accidentally
If a rate states how many CNY equal 1 USD, multiply a USD amount by that rate to estimate CNY. For the opposite direction, use a proper reverse quotation or a reciprocal calculation with suitable precision. A number such as “7.2” is incomplete without its direction.
Lookup and record workflow
In the historical rate tool, choose the date, source currency and target currency. Record the displayed rate and actual date, then retain the source amount, formula, result and page source. For recurring work, export a CSV or use a consistent worksheet.
Reimbursement, contracts and general accounting
A historical reference rate can support estimates, management analysis and transaction review. Reimbursement policies, contracts, tax rules or statutory accounting may specify a particular source or date, such as transaction date, posting date, month end or an official rate. Follow the applicable policy before relying on a general reference dataset.
Precision and rounding
Keep sufficient decimal places during calculation and round only at the final step according to the intended use. Early rounding can accumulate across large amounts or many transactions. Record the precision rule so the result can be reproduced later.
Confirm currency codes in the currency directory.
Sources, scope and review date
This article is general educational information and is not financial, investment, tax or accounting advice. For a specific payment, filing or bookkeeping decision, use the terms supplied by your bank or payment provider and the rules that apply to you.
Data and method note: when CurrencyFlow displays conversions or historical rates, it uses reference data with an actual provider date. Last reviewed: 2026-08-03.
Frequently asked questions
Why can the requested and actual dates differ?
The provider may return the most recent valid date when the requested date is a weekend, holiday or missing-data day.
Can I use a historical reference rate directly for tax filing?
Not necessarily. Tax or accounting rules may prescribe a specific source and date.
Can I obtain the reverse rate by taking the reciprocal?
It can be used as a mathematical reference with sufficient precision, but check whether an official reverse quotation is required.
How this guide is maintained
This guide is maintained by CurrencyFlow. Automated checks cover structure, duplication and basic consistency; they are not a claim of human expert endorsement. Dated public reference data is used as a comparison benchmark, while banks, cards, ATMs and transfer providers may add spreads, fees or use another processing date.
- Maintained by
- CurrencyFlow
- Last updated
- 2026-08-20