I would use the present perfect in the following sentence:
As of now, we have received 100 ticket requests.
If the present time was currently Wednesday morning, and if I was to replace the word "now" with "Wednesday morning," I would write the sentence like this, still using the present perfect:
As of Wednesday morning [that is, now], we have received 100 ticket requests.
Those reading that sentence on Wednesday morning would, correctly, understand the sentence to mean that currently we have received 100 tickets.
But what happens tomorrow when Wednesday morning represents the past? Had I written that same sentence on Thursday, thus referring to the past, I would have used the past perfect, especially if more tickets had come in since Wednesday morning:
As of Wednesday morning [that is, yesterday], we had received 100 ticket requests.
So my question is, do some sentences, such as the one I have illustrated, begin their lives grammatically correct, but become grammatically incorrect as time passes? Or perhaps some sentences require their reader to know the date and time they were written. What are your thoughts?