Humans, animals, or physical objects can change as time passes.
For example, a calf turns into a bull, a children turns into an adult, and etc.
In this context, a bull is here. Could we say "the calf was cuter than the bull is" to indicate the different look of the bull in different stages?
If not, what is the better sentence?
In this context, the weather changes day by day.
Why could we use "yesterday's weather" to indicate what the weather was like yesterday, and "today's weather" to indicate what the weather is like today, but why could not we use "yesterday's table" to indicate what the table was like yesterday, and "today's table" to indicate what the identical table is like today?