[quchen]

For the record, local time in Moscow is UTC+4; at the time of writing this comment, that is about 18 o'clock.

[sk00byd00]

Isn't the convention to only use the phrase o'clock when using a 12 hour notation?

[freehunter]

With 24 hour time, the proper way to say it would be 18 hundred.

[tzs]

As far as I've been able to determine, yes.