Clock Range Crosses Midnight
Classify a forward civil clock range; equal endpoints mean empty, not an implicit full day.
Description
Classify a forward civil clock range; equal endpoints mean empty, not an implicit full day.
An end clock value earlier than its start can denote crossing midnight in a forward cycle.
When to use this tool
Classify a forward civil clock range; equal endpoints mean empty, not an implicit full day.
- Prepare the supplied start, end fields for this operation.
- Compare the complete example with the representation used by your own input before carrying the result into another step.
How to use the tool and how it works
- Enter start, end. Use the exact text syntax, units and index conventions explained below.
- Run the tool. If input validation fails, correct the supplied fields before interpreting any result.
- Read result.crossesMidnight, result.forwardDuration. Interpret false, null and empty lists using the distinctions below; they can be valid outputs.
Require second-of-day bounds, set crossesMidnight when end<start and forwardDuration to nonnegative modulo(end-start,86400).1
| Input field | Meaning and representation | Accepted input |
|---|---|---|
| start | start. | Safe integer |
| end | end. | Safe integer |
| Output field | Interpretation |
|---|---|
| result | Object containing the named outputs below. |
| result.crossesMidnight | Flag for crosses midnight under the exact condition described above. |
| result.forwardDuration | The forward duration value under the stated formula or text convention. |
{
"input": {
"start": 80000,
"end": 100
},
"output": {
"result": {
"crossesMidnight": true,
"forwardDuration": 6500
}
}
}Limitations and assumptions
- Equal values imply zero duration and no crossing, not a full day. No dates or timezone transitions are inferred.
- Every declared top-level field is required and unexpected fields are rejected. Numeric inputs must be finite; ordinary text fields are bounded to 8,192 UTF-16 code units, with tighter operation-specific limits where stated.
- Lists are limited to 128 entries. JSON text must meet bounded size and depth checks, and numeric outputs beyond the safe finite magnitude are rejected. Exact large integers use decimal strings.
- Indexes are zero-based and spans have an exclusive end unless explicitly stated otherwise. A valid false, null or empty-list result is distinct from malformed input.
Alternative or Complementary methods
Keep elapsed durations, circular clocks, calendar months and epoch offsets distinct. Use a date/time method with explicit timezone and timescale rules for dated instants; arithmetic on one representation does not supply the others.
References
Similar or alternative tools
- Clock Components to Seconds Of Day
Join validated ordinary civil clock components into seconds of day; leap-second 60 is not accepted.
- Clock Forward Circular Gap
Compute forward circular clock gap on a fixed 86,400-second day; equal clocks give zero.