Photoperiod Timer Setting Calculator
Plan/audit actual daily timer minutes across midnight; 1–1439 requested minutes and same-zone fixed 24h clock, equal observed endpoints mean zero not inferred all-day, no photoperiod recommendation or DST inference.
Description
Daily timer endpoints wrap around midnight.
Daily timer endpoints wrap around midnight. Equal observed endpoints mean zero duration under this explicit fixed-day model.1
Enter integer clock minutes 0–1439 and requested duration 1–1439. Return planned off minute, midnight flag, observed duration and observed−requested difference.
When to use Photoperiod Timer Setting Calculator
Use Photoperiod Timer Setting Calculator when you need to evaluate the supplied records under the calculation and evidence rules below. No all-day inference, DST, time-zone conversion or crop photoperiod recommendation is supplied.
Prepare the measured crop, container, lighting or inventory records requested. Supply verified local catalogs, calibration factors and crop-stage limits; keep units and dates consistent.
How to use Photoperiod Timer Setting Calculator and understand its results
- Prepare the measured crop, container, lighting or inventory records requested. Supply verified local catalogs, calibration factors and crop-stage limits; keep units and dates consistent.
- Enter callerLightOnMinuteOfDay, callerRequestedOnMinutes, observedTimerOnMinuteOfDay, observedTimerOffMinuteOfDay using the field table and calculation rules, then run the tool.
- Read plannedOffMinuteOfDay, plannedCrossesMidnight, observedTimerOnMinutes, signedObservedMinusRequestedMinutes. The explanation below defines the units, signs, ordering and any flags or placeholder values.
- If the tool reports an input issue, correct the values and run it again. Apply the stated assumptions when interpreting a successfully returned result.
| Input field | Meaning | Value type; see rules below | Requirement |
|---|---|---|---|
| callerLightOnMinuteOfDay | Caller light on minute of day | number | Required |
| callerRequestedOnMinutes | Caller requested on minutes | number | Required |
| observedTimerOnMinuteOfDay | Observed timer on minute of day | number | Required |
| observedTimerOffMinuteOfDay | Observed timer off minute of day | number | Required |
Enter integer clock minutes 0–1439 and requested duration 1–1439. Return planned off minute, midnight flag, observed duration and observed−requested difference.
off=(plannedOn+requested)%1440; observed=(off−on+1440)%1440 Units, indexing, boundary conditions and exceptional cases are defined in the calculation rules above.
| Output field | Meaning | Value type |
|---|---|---|
| plannedOffMinuteOfDay | Planned off minute of day | number |
| plannedCrossesMidnight | Planned crosses midnight | boolean |
| observedTimerOnMinutes | Observed timer on minutes | number |
| signedObservedMinusRequestedMinutes | Signed observed minus requested minutes | number |
{
"input": {
"callerLightOnMinuteOfDay": 1080,
"callerRequestedOnMinutes": 720,
"observedTimerOnMinuteOfDay": 1080,
"observedTimerOffMinuteOfDay": 360
},
"output": {
"plannedOffMinuteOfDay": 360,
"plannedCrossesMidnight": true,
"observedTimerOnMinutes": 720,
"signedObservedMinusRequestedMinutes": 0
}
}Limitations and assumptions
No all-day inference, DST, time-zone conversion or crop photoperiod recommendation is supplied.
Numeric inputs, where present, must be finite. Follow the calculation-specific rules for overflow, underflow and exceptional cases. Missing required fields, extra fields, wrong value types and violations of the calculation rules are input errors. A successfully returned false flag is an evaluated outcome; its meaning is explained above.
Alternative or Complementary methods
Use Mist Propagation Interval Seconds Calculator: An on/off mist schedule needs to include any partial final cycle. This model starts with an on interval at time zero. For a complementary task, use Grow Lamp Energy KWH Monthly Calculator: Electrical lamp energy integrates actual daily on-time with measured bank power. The observation matrix defines the covered period.
References
-
Photoperiod Timer Setting Calculator — tool.io
Similar or alternative tools
- Mist Propagation Interval Seconds Calculator
An on/off mist schedule needs to include any partial final cycle. This model starts with an on interval at time zero.
- Grow Lamp Energy KWH Monthly Calculator
Electrical lamp energy integrates actual daily on-time with measured bank power. The observation matrix defines the covered period.