1. What is the DAY Function & How Does It Work?
The DAY function takes a valid date serial number and extracts the day of the month as an integer ranging from 1 to 31.
Formula Anatomy: The Parameter of DAY()
=DAY( serial_number )1. SERIAL_NUMBER (REQUIRED)
Which cell contains the date?
The cell reference (e.g. A2) or valid date string to extract day from.
A2 = "2026-08-12" ➔ Returns 122. Real-World Analytics Scenarios for DAY
💳 Scenario A: Monthly Billing Cycle Automation
Trigger recurring billing invoices on the exact day of the month customer joined.
=IF(DAY(TODAY())=DAY(A2), "Bill Customer Today 💳", "Not Due")📈 Scenario B: Daily Sales Pattern Distribution
Analyze whether sales are higher in early month (Days 1-10) vs end-of-month (Days 20-31).
=DAY(A2)📆 Scenario C: End-of-Month Due Alerts
Identify invoices due on the last day of the month.
=IF(DAY(A2) >= 28, "EOM Payroll/Invoice", "Regular")🎮 Live Interactive DAY Inspector Simulator
Pick any date to see =DAY(A2) extract the 1-31 day integer instantly!
EXTRACTED DAY OF MONTH (=DAY(A2)):Day 12
📊 Generated Excel Formula
=DAY(A2)🧪 Knowledge Check — DAY Function Quiz
Question 1 of 5Score: 0