Description
Return a date's ordinal occurrence of its weekday within its month and later occurrences.
Civil calendar arithmetic needs explicit year numbering, leap rules and index origins. A weekday mask or Gregorian component operation does not identify a timezone, working calendar or historical calendar reform.
Return a date's ordinal occurrence of its weekday within its month and later occurrences.
When to use this tool
Use Weekday Occurrence Remaining In Month when checking the stated weekday or Gregorian calendar convention.
How to use the tool and how it works
- Enter year, month, day. Use the units and conventions below.
- Run the tool. Correct any format, range, or cross-field input error before interpreting the output.
- Read occurrence, remaining. Use the output convention below.
Return a date's ordinal occurrence of its weekday within its month and later occurrences. Validate Gregorian year/month/day; occurrence = floor((day-1)/7)+1 and remaining = floor((lastDay-day)/7).1
| Input field | Meaning and units | Accepted input |
|---|---|---|
| year | Year | Required. Safe integer; minimum 1; maximum 9999. |
| month | Month | Required. Safe integer; minimum 1; maximum 12. |
| day | Day | Required. Safe integer; minimum 1; maximum 31. |
| Output field | Interpretation | Returned shape |
|---|---|---|
| occurrence | Occurrence | Required. Safe integer. |
| remaining | Budget minus use, in the same units; a negative value indicates excess use. | Required. Safe integer. |
{
"input": {
"year": 2024,
"month": 2,
"day": 15
},
"output": {
"occurrence": 3,
"remaining": 2
}
}Limitations and assumptions
- Occurrences refer to that date's own weekday, not an arbitrary requested weekday or work calendar.
- 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 an appropriate full calendar library and authoritative local rules when business days, historical dates or real scheduling matter.
References
Similar or alternative tools
- Month Index Relative Origin
Return signed month offset from a supplied year-month origin.
- Calendar Month Ordinal Serial Pair
Return a serial month coordinate.