public static String getHistoryTimeInteger his 获取当前系统时间 Calendar calendar = CalendargetInstance; 将当前时间向前调整his个小时 calendaraddCalendarHOUR_OF_DAY his; Date before =

public static String getPreviousDayTime(Integer hour) { // 获取当前系统时间 Calendar calendar = Calendar.getInstance(); // 将当前时间向前调整一天 calendar.add(Calendar.DAY_OF_MONTH, -1); Date previousDay = calendar.getTime();

    // 获取前一天的当前小时之前的时间
    calendar.setTime(previousDay);
    calendar.set(Calendar.HOUR_OF_DAY, hour);
    calendar.set(Calendar.MINUTE, 0);
    calendar.set(Calendar.SECOND, 0);
    Date previousDayRounded = calendar.getTime();

    // 格式化时间为字符串
    SimpleDateFormat formatter = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
    String formattedTime = formatter.format(previousDayRounded);
    return formattedTime;