1、字符串类型转成LocalDateTime

public static LocalDateTime string2LocalDateTime(String dateStr) {        return LocalDateTime.parse(dateStr, DateTimeFormatter.ofPattern("yyyy-MM-dd HH:mm:ss"));    }

2、两个日期比拟

if (nowDate.compareTo(endTimeDate) < 0) {     // 代码逻辑}

3、计算日期相差工夫(参考地址:https://www.cnblogs.com/jpfss...)

java.time.Duration duration = java.time.Duration.between(LocalDateTime   startTime,  LocalDateTime  endTime );例如:     duration.toMinutes()    //两个时间差的分钟数toNanos()//纳秒toMillis()//毫秒toMinutes()//分钟toHours()//小时toDays()//天数