Halocho #801 - What day of the Omer is it today?

Before making the Bracha on counting the Omer, one should know which day one is going to count.

If one has not yet counted the Omer, and somebody wants to know which day we're up to, you should tell them "yesterday was day such-and-such".

If, instead, you replied "today is such-and-such" you may not be allowed to make a Bracha on that night's count, since you already counted.

However, you should still count "properly" (without a Bracha) since you have to mention the weeks as well as the days.

Source: Kitzur Shulchan Aruch 120:3

- Danny
Wednesday, 7 Sivan 5771 22nd day of the Omer