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Day of Week Calculator — result sheet
Find the weekday and ISO weekday number for any valid Gregorian date from year 1 through 9999.
Inputs used
Results
Visual chart
Breakdown
Calculation steps
Returned data table
Formula and methodology
Formula: Map the valid proleptic Gregorian date to its weekday; ISO numbering is Monday = 1 through Sunday = 7.
Use this tool to identify the weekday for a historical, current, or future Gregorian calendar date without timezone-dependent clock arithmetic.
This result follows the calculator's declared inputs, precision, validation boundaries, and model limits.
Input contract
- Date
Worked example
| Input | Value |
|---|---|
| Date | 2026-01-01 |
Thursday; ISO weekday number 4.
Assumptions and limits
- The proleptic Gregorian calendar is used for all supported years.
- The result is a calendar weekday, not a locale-specific date-format interpretation.
Calculator note
Source and methodology
Use the official WorldCalculate methodology policy for the source, formula, precision, and boundary standards behind this calculator.
Planning estimate, not financial, medical, legal, or professional advice. © WorldCalculate — reuse with attribution. Built and curated by Hassan ALRowaie.
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