Add date and time to Linux terminal title (Gnome Terminal, xterm, urxvt, rxvt)

Here is easy way add date and time to Linux terminal title. This trick works at least following terminals Gnome Terminal, xterm, urxvt, rxvt.
Simply type the following command line:
while sleep 1 ; do echo -ne '\033]2;'`date`'\007'; done &

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