If you were able to obtain information about reports prior to them being released to the general public you would have insider information. Should you then trade shares in the company (which is illegal as you have an unfair advantage) you could be charged with insider trading.

However if you do some research into the company and look at the dates upon which it has previously issued its reports ( going back over the past few years) then you are able to estimate fairly accurately when future reports are likely to be made. These dates can then be scheduled for alerts to be generated in due course using any of the many methods available to us.

Many investors who choose to buy shares just prior to dividends being declared will do this.