Description
Add day fractions and separate a signed whole-day carry.
Timestamp notation distinguishes written precision, quantization and carry into the next larger field. Padding a fraction, rounding it and propagating an end-of-day marker are different operations and do not establish clock accuracy.
Add day fractions and separate a signed whole-day carry.
When to use this tool
Use Day Fraction Midnight Wrap when checking one explicit timestamp precision, rounding or carry convention.
How to use the tool and how it works
- Enter dayFraction, addedFraction. Use the units and conventions below.
- Run the tool. Correct any format, range, or cross-field input error before interpreting the output.
- Read dayCarry, withinDayFraction. Use the output convention below.
Add day fractions and separate a signed whole-day carry. Require their sum finite; dayCarry = floor(total) and withinDayFraction = total-dayCarry.1
| Input field | Meaning and units | Accepted input |
|---|---|---|
| dayFraction | Day Fraction | Required. Finite number. |
| addedFraction | Added Fraction | Required. Finite number. |
| Output field | Interpretation | Returned shape |
|---|---|---|
| dayCarry | floor(dayFraction+addedFraction); can be negative. | Required. Safe integer. |
| withinDayFraction | Nonnegative modulo-one remainder, in [0,1). | Required. Finite number. |
{
"input": {
"dayFraction": 0.75,
"addedFraction": 0.5
},
"output": {
"dayCarry": 1,
"withinDayFraction": 0.25
}
}Limitations and assumptions
- Negative totals still return a within-day fraction in [0,1); physical day length is not inferred.
- Inputs must satisfy both the field types and the cross-field conditions above. Invalid input causes an error; a successful false flag or documented placeholder is a different result.
- Numeric calculations use binary floating point unless exact decimal-integer arithmetic is explicitly stated. No hidden measurement tolerance or decimal rounding is added; nonfinite or out-of-contract results are rejected. Numeric signed-zero results are exported as zero.
Alternative or Complementary methods
Use complete date-time arithmetic when a carry must change a date or interact with timezone transitions.
References
Similar or alternative tools
- Date Time End Of Day Carry Field
Normalize a date-time end-of-day hour field.
- Date: Date Boundary Midnight Endpoint Label
Classify midnight token spellings and normalize end-of-day notation.