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About the 2018 Calendar
The 2018 calendar above shows all 12 months in a standard Gregorian format starting on Sunday. Each month displays the correct number of days, with weekends highlighted in blue and today's date highlighted in solid blue. 2018 is not a leap year — February has 28 days and the year has 365 days total.
2018 begins on a Monday (January 1) and ends on an Monday (December 31). The year contains approximately 260 working days (weekdays excluding weekends), subject to public holidays in your country.
ISO Week Numbers Explained
The ISO 8601 standard defines week numbering as follows: Week 1 is the week containing the year's first Thursday. This means ISO Week 1 can begin as early as December 29 of the previous year or as late as January 4. Consequently, some years have 52 ISO weeks and some have 53.
ISO weeks are widely used in European business scheduling, manufacturing, and project planning. If you see a deadline listed as “W14 2018” or “ISO week 14,” that refers to the Monday–Sunday period that ISO week 14 covers — use the Week Number Calculator to find any date’s ISO week.
How to Plan Your 2018
Mark public holidays first
Check the official public holidays for your country in 2018 to identify long weekends. Plan vacation requests around these to maximize time off with the fewest leave days.
Count quarter boundaries
Q1: Jan–Mar, Q2: Apr–Jun, Q3: Jul–Sep, Q4: Oct–Dec. Each quarter has roughly 65 working days. Set quarterly goals and reviews at the start of each quarter.
Identify long weekends
Look for public holidays that fall on Monday or Friday — these create 3-day weekends. A holiday on Tuesday or Thursday enables a 4-day weekend with just one leave day.
Use ISO weeks for project tracking
Reference weeks by ISO number (e.g., "deliverable due W22") instead of specific dates. This makes schedules easier to communicate internationally and shift without re-stating every date.