Java SQL Time Calculate getPreviousDateTimeString(String format)

Description

get Previous Date Time String

License

Open Source License

Declaration

public static String getPreviousDateTimeString(String format) 

Method Source Code

//package com.java2s;
import java.util.Calendar;

import java.sql.Timestamp;
import java.text.SimpleDateFormat;

public class Main {

    public static String getPreviousDateTimeString(int days) {
        Calendar calendar = Calendar.getInstance();
        calendar.add(Calendar.DAY_OF_MONTH, -days);

        return toDateTimeString(calendar);
    }/*  ww  w .ja  v a2  s  . co m*/

    public static String getPreviousDateTimeString(String datetime, int days) {
        Calendar calendar = toCalendar(datetime);
        calendar.add(Calendar.DAY_OF_MONTH, -days);

        return toDateTimeString(calendar);
    }

    public static String getPreviousDateTimeString(String format) {
        Calendar calendar = Calendar.getInstance();
        calendar.add(Calendar.DAY_OF_MONTH, -1);

        return toDateTimeString(calendar, format);
    }

    public static String getPreviousDateTimeString() {

        return getPreviousDateTimeString("yyyy-MM-dd HH:mm:ss");
    }

    public static String toDateTimeString(java.util.Date date) {
        if (date == null)
            return "";

        String dateString = toDateString(date);
        String timeString = toTimeString(date);

        if (dateString == null || timeString == null)
            return "";

        return dateString + " " + timeString;
    }

    public static String toDateTimeString(Calendar calendar) {
        return new SimpleDateFormat("yyyy-MM-dd HH:mm:ss").format(calendar.getTime());
    }

    public static String toDateTimeString(Calendar calendar, String format) {
        return toDateTimeString(calendar.getTime(), format);
    }

    public static String toDateTimeString(long datetime) {
        return new SimpleDateFormat("yyyy-MM-dd HH:mm:ss").format(new java.util.Date(datetime));
    }

    public static String toDateTimeString(long datetime, String format) {
        SimpleDateFormat sdf = new SimpleDateFormat(format);
        return sdf.format(new java.util.Date(datetime));
    }

    public static String toDateTimeString(java.util.Date date, String format) {
        SimpleDateFormat sdf = new SimpleDateFormat(format);
        return sdf.format(date);
    }

    public static String toDateTimeString(Timestamp time) {
        long datetime = time.getTime();
        return toDateTimeString(datetime);
    }

    public static String toDateTimeString(java.sql.Date date) {
        long datetime = date.getTime();
        return toDateTimeString(datetime);
    }

    public static Calendar toCalendar(String yearStr, String monthStr, String dayStr, String hourStr,
            String minuteStr, String secondStr) {
        int year, month, day, hour, minute, second;

        try {
            year = Integer.parseInt(yearStr);
            month = Integer.parseInt(monthStr);
            day = Integer.parseInt(dayStr);
            hour = Integer.parseInt(hourStr);
            minute = Integer.parseInt(minuteStr);
            second = Integer.parseInt(secondStr);
        } catch (Exception e) {
            return null;
        }

        return toCalendar(year, month, day, hour, minute, second);
    }

    public static Calendar toCalendar(String datetime) {
        int index = datetime.indexOf(" ");
        String date = datetime.substring(0, index);
        String time = datetime.substring(index + 1);

        int dateSlash1 = date.indexOf("-");
        int dateSlash2 = date.lastIndexOf("-");

        if (dateSlash1 <= 0 || dateSlash1 == dateSlash2)
            return null;

        int timeColon1 = time.indexOf(":");
        int timeColon2 = time.lastIndexOf(":");

        if (timeColon1 <= 0 || timeColon1 == timeColon2)
            return null;

        String yearStr = date.substring(0, dateSlash1);
        String monthStr = date.substring(dateSlash1 + 1, dateSlash2);
        String dayStr = date.substring(dateSlash2 + 1);

        String hourStr = time.substring(0, timeColon1);
        String minuteStr = time.substring(timeColon1 + 1, timeColon2);
        String secondStr = time.substring(timeColon2 + 1);
        ;

        int year, month, day, hour, minute, second;

        try {
            year = Integer.parseInt(yearStr);
            month = Integer.parseInt(monthStr);
            day = Integer.parseInt(dayStr);
            hour = Integer.parseInt(hourStr);
            minute = Integer.parseInt(minuteStr);
            second = Integer.parseInt(secondStr);
            Calendar calendar = Calendar.getInstance();

            calendar.set(year, month - 1, day, hour, minute, second);
            return calendar;
        } catch (Exception e) {
            return null;
        }
    }

    public static Calendar toCalendar(int[] dates) {
        if (dates == null || dates.length < 6)
            return null;

        return toCalendar(dates[0], dates[1], dates[2], dates[3], dates[4], dates[5]);
    }

    public static Calendar toCalendar(int year, int month, int day, int hour, int minute, int second) {
        Calendar c = Calendar.getInstance();
        c.set(Calendar.YEAR, year);
        c.set(Calendar.MONTH, month - 1);
        c.set(Calendar.DATE, day);
        c.set(Calendar.HOUR_OF_DAY, hour);
        c.set(Calendar.MINUTE, minute);
        c.set(Calendar.SECOND, second);

        return c;
    }

    public static String toDateString(java.util.Date date, String spe) {
        if (date == null)
            return "";

        Calendar calendar = Calendar.getInstance();

        calendar.setTime(date);
        int month = calendar.get(Calendar.MONTH) + 1;
        int day = calendar.get(Calendar.DAY_OF_MONTH);
        int year = calendar.get(Calendar.YEAR);

        String monthStr = "" + month;
        String dayStr = "" + day;
        String yearStr = "" + year;

        if (month < 10)
            monthStr = "0" + month;

        if (day < 10)
            dayStr = "0" + day;

        return yearStr + spe + monthStr + spe + dayStr;
    }

    public static String toDateString(java.util.Date date) {
        return toDateString(date, "-");
    }

    public static String toDateString(Calendar calendar) {
        return new SimpleDateFormat("yyyy-MM-dd").format(calendar.getTime());
    }

    public static String toTimeString(java.util.Date date) {
        if (date == null)
            return "";

        Calendar calendar = Calendar.getInstance();

        calendar.setTime(date);
        return toTimeString(calendar.get(Calendar.HOUR_OF_DAY), calendar.get(Calendar.MINUTE),
                calendar.get(Calendar.SECOND));
    }

    public static String toTimeString(int hour, int minute, int second) {
        String hourStr = "" + hour;
        String minuteStr = "" + minute;
        String secondStr = "" + second;

        if (hour < 10)
            hourStr = "0" + hour;

        if (minute < 10)
            minuteStr = "0" + minute;

        if (second < 10)
            secondStr = "0" + second;

        return hourStr + ":" + minuteStr + ":" + secondStr;
    }
}

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