Here is the list of auspicious dates for opening business in year 2013, which is produced based on the Chinese almanac Tong Shu. It can be applied to new business opening, or reopening of business after a break/holiday. (Click the image to enlarge)
Note that 18/2 and 21/2 are the auspicious dates for opening business right after Chinese New Year 2013.
Bear in mind that although the Tong Shu is a compilation of Chinese astrology and calendaring studies gathering wisdom of thousands of years, we should use it wisely and rationally, but not be too superstitious on it.