day = new Date(); hour = day.getHours(); if (hour>=5 && hour<12) greeting = "Доброе утро, "; else { if (hour>=12 && hour<18) greeting = "Добрый день, "; else { if (hour>=18 && hour<24) greeting = "Добрый вечер, "; else { if (hour>=0 && hour<5) greeting = "Доброй ночи, "; } } } document.write(greeting);