Description
Convert a decimal hour to nearest whole civil second.
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.
Convert a decimal hour to nearest whole civil second.
When to use this tool
Use Date: Decimal Hour Civil Time Field when checking one explicit timestamp precision, rounding or carry convention.
How to use the tool and how it works
- Enter decimalHour. Use the units and conventions below.
- Run the tool. Correct any format, range, or cross-field input error before interpreting the output.
- Read result. Expand result to inspect the returned fields.
Convert a decimal hour to nearest whole civil second. Require decimalHour in [0,24); round hour*3600 with JavaScript Math.round, split fields and return dayCarry one when rounding reaches 86400.1
| Input field | Meaning and units | Accepted input |
|---|---|---|
| decimalHour | Decimal Hour | Required. Finite number. |
| Output field | Interpretation | Returned shape |
|---|---|---|
| result | Returned object; expand its named members below. | Required. Object. |
| result.hour | Hour | Calculated result member: number. |
| result.minute | Minute | Calculated result member: number. |
| result.second | Second | Calculated result member: number. |
| result.dayCarry | Day Carry | Calculated result member: number. |
{
"input": {
"decimalHour": 12.5
},
"output": {
"result": {
"hour": 12,
"minute": 30,
"second": 0,
"dayCarry": 0
}
}
}Limitations and assumptions
- Near-midnight input can round to the next day; no calendar date or timezone is applied.
- Outputs are nested inside result. 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
- Civil Time Millisecond Tie Carry
Round one second and millisecond pair under up or even tie policy.
- Datetime Minute Rounding Day Carry
Round valid civil time to the nearest minute.