My few cents: In actual practice I would probably just say or write:

"Can we move our meeting on April 23rd on 7 p.m. up to 5 p.m.? I'm unable to make it at 7 p.m." or "Can we move our meeting on April 23rd from 7 p.m. to 5 p.m.?"

If this was a much higher boss (or one that required a lot of deference) I would write: >Would it be

convenient for you to move/reschedule our meeting on April 23rd from 7 p.m. to 5 p.m.? I am unable to make a 7 p.m. appointment on that date.

To reschedule for an earlier time (or "moving the meeting up) brings up the possibility of changing the date as well as the time, in my mind.

My few cents: In actual practice I would probably just say or write:

"Can we move our meeting on April 23rd on 7 p.m. up to 5 p.m.? I'm unable to make it at 7 p.m." or "Can we move our meeting on April 23rd from 7 p.m. to 5 p.m.?"

If this was a much higher boss (or one that required a lot of deference) I would write:

Would it be convenient for you to move/reschedule our meeting on April 23rd from 7 p.m. to 5 p.m.? I am unable to make a 7 p.m. appointment on that date.

To reschedule for an earlier time (or "moving the meeting up) brings up the possibility of changing the date as well as the time, in my mind.