[_Aruch Hashulchan_ 493:4](http://he.wikisource.org/wiki/%D7%A2%D7%A8%D7%95%D7%9A_%D7%94%D7%A9%D7%95%D7%9C%D7%97%D7%9F_%D7%90%D7%95%D7%A8%D7%97_%D7%97%D7%99%D7%99%D7%9D_%D7%AA%D7%A6%D7%92#.D7.A1.D7.99.D7.9E.D7.9F_.D7.AA.D7.A6.D7.92_.D7.A1.D7.A2.D7.99.D7.A3_.D7.93) 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).