常用的日期时间操作工具

public class AppsDateUtil {

private static String DATE_FORMAT = "yyyy-MM-dd HH:mm:ss";

public static String getStringFromDate(Date date){
SimpleDateFormat sdf = new SimpleDateFormat(DATE_FORMAT,Locale.CHINA);
String dateStr = sdf.format(date);
return dateStr;
}

public static Date getDateFromString(String string){
SimpleDateFormat sdf = new SimpleDateFormat(DATE_FORMAT,Locale.CHINA);
Date date = null;
try {
date = sdf.parse(string);
} catch (ParseException e) {
e.printStackTrace();
}
return date;
}

public static String getStringFromDate(Date date,String template){
SimpleDateFormat sdf = new SimpleDateFormat(template,Locale.CHINA);
String dateStr = sdf.format(date);
return dateStr;
}

public static Date getDateFromString(String string,String template){
SimpleDateFormat sdf = new SimpleDateFormat(template,Locale.CHINA);
Date date = null;
try {
date = sdf.parse(string);
} catch (ParseException e) {
e.printStackTrace();
}
return date;
}

public static String getStringFromDateString(String date,int length){
try{
String subString = date.substring(0,length);
return subString;
}catch(Exception ex){
ex.printStackTrace();
}
return "";
}

public static long getTimeIntervalFromString(String date){
Date d = getDateFromString(date);
return d.getTime();
}

public static long getTimeIntervalFromString(String date,String dateFormat){
Date d = getDateFromString(date,dateFormat);
return d.getTime();
}

public static boolean within(String date,long timeGap){
Date d1 = new Date();
Date d2 = getDateFromString(date,"yyyy-MM-dd");
if(d1.getTime() - d2.getTime() < timeGap){
return true;
}
return false;
}

public static String timeStampString(){
Date now = new Date();
String s = getStringFromDate(now,"yyyyMMddHHmmss");
return s;
}

public static String getCurrentTime(String format) {
Date date = new Date();
SimpleDateFormat sdf = new SimpleDateFormat(format, Locale.getDefault());
String currentTime = sdf.format(date);
return currentTime;
}

public static String getCurrentTime() {
return getCurrentTime("yyyy-MM-dd  HH:mm:ss");
}

}