Updated from 10:37 a.m. EDT

McDonald's ( MCD) said Monday that global same-store sales rose 1.4% last month, but that foreign currency rates are expected to hurt first-quarter revenue and earnings.

The fast-food chain said that if foreign currency rates remain at current levels, with the dollar strong relative to its competitors, the translation may decrease first-quarter revenue by at least $600 million and earnings by 7 cents to 9 cents a share.

"In addition, as previously stated, commodity cost pressures are expected to have a greater impact during the first half of the year," the company said in a statement.

McDonald's also said that first-quarter results will include an after-tax, nonoperating gain of 3 cents to 4 cents a share stemming from the sale of the company's minority interest in RedBox Automated Retail, a chain of self-service DVD rental vending machines. McDonald's said it has tentative plans to post first-quarter results on April 22.

"We remain confident in the fundamental strength of the McDonald's business," CEO Jim Skinner said in a statement. "We have the right strategies in place to grow the business for the long-term and we have the operating experience to manage through the current environment."

The news came alongside McDonald's same-store sales report for February, which showed that the company enjoyed strong comparable sales results despite harsh economic headwinds. The company said sales rose 1.4% last month, which reflects an extra day in February 2008 because of leap year. Excluding that difference, same-store sales rose about 5.4%.

If you liked this article you might like

5 Things on the Menu at Jollibee, the McDonald's of the Philippines

How Healthy Is That Happy Meal? Inside the Kids' Menus at McDonald's and More

McDonald's Is Still Serving Your Kids Belly Bombs

4 Ways McDonald's Is Radically Different in Hong Kong

Going Out to McDonald's in Hong Kong Is Way Different Than in America