minha intenção é criar um sistema de pessoas onlines no meu site, a cada 30s eu mando uma requisição em ajax pro meu servidor e marco o ip e a hora da visita, minha duvida é a seguinte no meu banco eu gravo no campo hora ( 03:29 ) usando a função date como posso estar comparando esta hora gravada com meu banco com a hora atual e saber se já se passaram 30 segundos ? pois assim quando se passa 30 segundos eu deleto do banco de dados as visitas ativas
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