Is earth began to spin a little bit faster 1. summers would be colder 2. days would get shorter 3. tides would be higher

If Earth began to spin faster, then the days would be shorter. That is ... less than 24 hours. Depending on how fast the spin is, the days would be 22 hours or 20 hours or 16 hours Etc. Whatever the total time became, half of it would be daylight and the other half would be Darkness.