HTTP Date Precision Tie Tool

Description

Compare already-normalized whole-second HTTP date values, without parsing obsolete date formats.

Web protocol data has several layers: a complete message or URL, individual fields or components, and the literal tokens within them. Delimiter presence, spelling, comparison rules, and parser normalization can affect results. A check of one component needs its stated scope before it can be used in a larger parser or policy decision.

Compare already-normalized whole-second HTTP date values, without parsing obsolete date formats.

When to use this tool

Use HTTP Date Precision Tie when you need one stated URL, header, or protocol-component check in a diagnostic or parser workflow. Supply the input level specified below.

How to use the tool and how it works

Enter firstEpochSeconds, secondEpochSeconds. Use the units and conventions below.
Run the tool. Correct any format, range, or cross-field input error before interpreting the output.
Read sameHttpSecond, differenceDecimal. Inspect sameHttpSecond before interpreting the associated values.

Compare firstEpochSeconds and secondEpochSeconds exactly for sameHttpSecond and return their exact integer difference as decimal text using BigInt subtraction.^[1]

Input field	Meaning and units	Accepted input
firstEpochSeconds	First Epoch Seconds	Required. Safe integer.
secondEpochSeconds	Second Epoch Seconds	Required. Safe integer.

Output field	Interpretation	Returned shape
sameHttpSecond	Same Http Second	Required. Boolean.
differenceDecimal	Second minus first, calculated as an exact integer and returned as decimal text.	Required. Text; maximum UTF-16 length 8192.

json

{
  "input": {
    "firstEpochSeconds": 100,
    "secondEpochSeconds": 100
  },
  "output": {
    "sameHttpSecond": true,
    "differenceDecimal": "0"
  }
}

Limitations and assumptions

The inputs are already integer second coordinates. No timestamp parsing, truncation from subsecond precision, time-zone conversion, or HTTP-date syntax validation is performed.
The field tables state structural bounds; the mechanics also specify cross-field constraints. Malformed inputs and unsupported domains cause errors. A successful false flag, empty branch value, or zero placeholder has the meaning stated above and is distinct from an input error.

Alternative or Complementary methods

Use a complete URL or header parser when the task involves an entire field or message. Test actual browser, server, or cache behavior separately when a security or protocol decision depends on more than this component.

References

Calculation and input contract: web/http-date-precision-tie — tool.io

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