JavaScript
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SELECT DATE_FORMAT(column_name, '%d/%m/%Y') FROM tablenamevar limit = 24 * 3600 * 1000; // 24 часа
var localStorageInitTime = localStorage.getItem('localStorageInitTime');
if (localStorageInitTime === null) {
localStorage.setItem('localStorageInitTime', +new Date());
} else if(+new Date() - localStorageInitTime > limit)
localStorage.clear();
localStorage.setItem('localStorageInitTime', +new Date());
}