Weekday Calculator
One Date, Six Useful Facts
Knowing that a date falls on a Tuesday is often just the starting point — the more useful question is usually "does that mean it's a weekday," "what quarter is it in," or "how far into the year is it." Rather than looking each of those up separately, this calculator derives all of them from a single input date in one pass, using the same underlying calendar logic (day-of-week, ISO week number, and day-of-year) that other date tools on this site rely on.
The Logic
Weekday = day-of-week name for the given date
Weekend = Saturday or Sunday
Quarter = ((Month − 1) ÷ 3) + 1
Day of Year = count of days since January 1st, inclusive
Weekend = Saturday or Sunday
Quarter = ((Month − 1) ÷ 3) + 1
Day of Year = count of days since January 1st, inclusive
A Worked Example
For July 17, 2026:
| Metric | Value |
|---|---|
| Day of the week | Friday |
| Weekend | No |
| Quarter | Q3 |
| ISO week number | 29 |
| Day of year | 198 |
| Days remaining in year | 167 |
Where This Calculation Matters
- Confirming historical or future dates — checking which day of the week a past event, birthday, or future deadline actually falls on.
- Quarterly reporting — quickly identifying which fiscal or calendar quarter a given date belongs to.
- Weekend-sensitive scheduling — confirming whether a specific date lands on a weekend before setting a delivery or appointment.
How to Use This Calculator
- Enter any date.
- Select Calculate to see the day of the week, weekend status, quarter, ISO week number, day of year, and days remaining in the year.
Related Calculations
For the formal ISO week-numbering rules behind the week number shown here, see the Week Number Calculator. To view the date in a full month grid, use the Calendar Calculator.