The first day of the month is the beginning of a new month.

He is learning how to operate the new machine.

The operation time of this machine is 8 hours a day.

This machine is running 24 hours a day.

We plan to hold the meeting in Western European Time.

We will start the meeting at 3 p.m. Central European Time.

I will start the meeting at 9 a.m. Eastern European Time.

This system enables real-time operation.

The time complexity of this algorithm is O(n).

He tried to solve the problem all day long.