Please reply me at 17:00 today.

[output]

Is the following sentence natural and commly use in English-speaking countries?

Please reply me at 17:00 today.

Title edited by Rover_KE.

 

[Rover_KE]

Is the following sentence natural and commonly used in English-speaking countries?

"Please reply me at 17:00 today."

Delete 'me'.

It would be more colloquial in British English if you said at 5pm.

 

[5jj]

No.

Please reply (to me) at 17.00 today.

We wouldn't generally need to add the 'to me'. It's unusual to specify a time for replying. How do you want the other person to reply, by email, text, phone, or in some other way?

(Crossposted)

 

[Tdol]

Is the time the limit? If so, use by. If the time is the time for the reply, use at.