var now = new Date();
var year = now.getYear();
year += (year < 1900) ? 1900 : 0;

At the end of this code segment, the year variable holds the current year in the four-digit convention. For more information, read The Year 2000, our in-depth article about Y2K issues in JavaScript.

People who read this tip also read these tips:

• Debugging Date-Based Scripts
• Server-Side Includes
• Hiding Pages in A Print Template
• Computing Business Days
• Converting Dates to Strings