[Grammar] on the second day

[Will17]

Hello,

I can't figure out whether "on" is necessary here. Can you help me please?

A: How was your trip to France?

B: Great but on the first day, it was quite hard to understand my customers.

A: and how was it on the second day?

Thanks a lot,
Will

 

[bhaisahab]

Hello,

I can't figure out whether "on" is necessary here. Can you help me please?

A: How was your trip to France?

B: Great but on the first day, it was quite hard to understand my customers.

A: and how was it on the second day?

Thanks a lot,
Will

It's fine but it's not necessary.

 

[Boris Tatarenko]

Can we use "in" instead of "on"?

 

[SoothingDave]

Can we use "in" instead of "on"?

No.