How to Make Calendar
In this video, I break down a powerful Excel formula that generates a complete annual calendar — all 12 months, all 6-week grids — using just a single cell formula. No VBA, no macros, no helper columns.
👇 File Download Link:
https://tinyurl.com/SLS-Calendar
🔍 What you'll learn:
• How LAMBDA turns a formula into a reusable custom function
• How REDUCE iterates over all 12 months to build the calendar incrementally
• How SEQUENCE generates day numbers and grid rows automatically
• How WEEKDAY aligns each month's first day to the correct column
• How VSTACK and HSTACK stack rows and columns dynamically
📅 The formula accepts a calendar year as input (from cell D1) and outputs a perfectly formatted year-view calendar — headers, month labels, and date grids all included.
✅ Who this is for:
— Excel users who want to move beyond basic formulas
— Anyone learning dynamic array functions (SEQUENCE, REDUCE, VSTACK)
— Professionals who want to automate date-based layouts
📁 Download the sample file: [ https://docs.google.com/spreadsheets/d/1ng... ]
📌 Timestamp chapters:
0:00 — Introduction & formula overview
1:30 — Setting up the LAMBDA wrapper
3:00 — SEQUENCE for months (1–12)
4:45 — REDUCE: looping through each month
7:00 — Building the week grid with SEQUENCE
9:30 — WEEKDAY offset explained
11:00 — VSTACK & HSTACK to assemble the layout
13:30 — Final result & customization tips
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