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Date: Weekday Mask Bitset Label Tool

Decode a seven-bit weekday mask with Monday as bit zero, returning ordered labels and no scheduling assumptions.

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Description

Decode a seven-bit weekday mask to labels.

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.

Decode a seven-bit weekday mask to labels.

When to use this tool

Use Date: Weekday Mask Bitset Label when checking the stated weekday or Gregorian calendar convention.

How to use the tool and how it works

  1. Enter mask. Use the units and conventions below.
  2. Run the tool. Correct any format, range, or cross-field input error before interpreting the output.
  3. Read result. Expand result to inspect the returned fields.

Decode a seven-bit weekday mask to labels. Require whole mask in [0,127]; bits zero through six select Mon through Sun in that order.1

Input fieldMeaning and unitsAccepted input
maskMaskRequired. Safe integer.
Output fieldInterpretationReturned shape
resultReturned object; expand its named members below.Required. Object.
result.weekdaysNames for set bits; bit 0 is Monday and bit 6 is Sunday.Calculated result member: array.
json
{
  "input": {
    "mask": 65
  },
  "output": {
    "result": {
      "weekdays": [
        "Mon",
        "Sun"
      ]
    }
  }
}

Limitations and assumptions

  • The mask does not identify holidays, jurisdictional workweeks or particular dates.
  • 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 an appropriate full calendar library and authoritative local rules when business days, historical dates or real scheduling matter.

References

  1. Calculation and input contract: date/weekday-mask-bitset-label — tool.io

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