Changing Color Font based on date/time column

Hi,
I need some help with a macro and I’m not very proficient in visual basic

What I want to do is change the font color each time the date/time row changes.

Column A3 has date/ time is in that column

I want to change the font color for Range A3:H3 to red

Then in the next row (A4:H4) change it to red if the date / time in A4 is the same as A3, but if it is higher by 30 minutes change it to another color. This continues down another 30 rows (A?:H?) or so until no more data in Time / date column.

I could not figure out how to do this in the conditional formatting manager so I turned to a simple macro that isn’t so simple for me.

Thanks,

Mike