_Aruch Hashulchan_ 493:4 cites, if I'm reading him right, "various customs about [the restrictions of these days]. Some have practiced a prohibition __from immediately after _Pesach___ until the 33d of the _omer_ and from then on weddings and haircuts are permitted, because a _midrash_ has it that fifteen days before _Shavuos_ [the students of _Rabi Akiva_] stopped dying, so that 34 days are left; it would have been logical to practice the prohibition until the 35th of the count, but we say part of the day is like its whole, so [these things are] permitted on the day of the 34th and not earlier.... [And others keep the second 'half'.]" (Emphasis added.)

As always, for a matter of practical _halacha_, [CYLOR](http://en.wiktionary.org/wiki/CYLOR).