Description
Use exact integers for (secondYear - firstYear) × monthsInSuppliedYear + secondMonth - firstMonth.
Calendar coordinates depend on an era, origin, day-start rule, and sometimes an arithmetic rather than observational convention. A supplied coordinate difference does not resolve those choices.
Use exact integers for (secondYear - firstYear) × monthsInSuppliedYear + secondMonth - firstMonth.
When to use this tool
Use Public Hijri Month Source Gap when you need a documented calendar convention or source-coordinate comparison.
How to use the tool and how it works
- Enter firstMonth, secondMonth, firstYear, secondYear, monthsInSuppliedYear. Use the units and conventions below.
- Run the tool. Correct any format, range, or cross-field input error before interpreting the output.
- Read monthGapDecimal. Use the output convention below.
Use exact integers for (secondYear - firstYear) × monthsInSuppliedYear + secondMonth - firstMonth. Return monthGapDecimal.1
| Input field | Meaning and units | Accepted input |
|---|---|---|
| firstMonth | First Month | Required. Safe integer; minimum 1. |
| secondMonth | Second Month | Required. Safe integer; minimum 1. |
| firstYear | First Year | Required. Safe integer. |
| secondYear | Second Year | Required. Safe integer. |
| monthsInSuppliedYear | Months In Supplied Year | Required. Safe integer; minimum 1. |
| Output field | Interpretation | Returned shape |
|---|---|---|
| monthGapDecimal | Month Gap Decimal | Required. Text; maximum UTF-16 length 8192. |
{
"input": {
"firstMonth": 11,
"secondMonth": 2,
"firstYear": 1445,
"secondYear": 1446,
"monthsInSuppliedYear": 12
},
"output": {
"monthGapDecimal": "3"
}
}Limitations and assumptions
- This assumes a fixed caller-supplied month count per year and does not convert lunar observations or month lengths into days.
- 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
Consult the source calendar and authoritative date information for actual observance, conversion, or historical dating.
References
Similar or alternative tools
- Hijri Year Civil Tabular Remainder
For positive integer year, compute cycleYear = (year - 1) modulo 30 + 1.
- Public Calendar Day Start Offset
Subtract suppliedDayStart from recordedTime, divide by positive suppliedDayLength with floor for dayIndex, and return a nonnegative withinDay remainder.