android 中 系统日期时间的获取
import java.text.SimpleDateFormat; SimpleDateFormat formatter = new SimpleDateFormat ("yyyy年MM月dd日 HH:mm:ss "); Date curDate = new Date(System.currentTimeMillis());//获取当前时间 String str = formatter.format(curDate);
可以获取当前的年月时分,也可以分开写:
SimpleDateFormat sDateFormat = new SimpleDateFormat("yyyy-MM-dd hh:mm:ss"); String date = sDateFormat.format(new java.util.Date());
如果想获取当前的年月,则可以这样写(只获取时间或秒种一样):
SimpleDateFormat sdf=new SimpleDateFormat("yyyy-MM"); String date=sdf.format(new java.util.Date());
当然还有就是可以指定时区的时间(待):
df=DateFormat.getDateTimeInstance(DateFormat.FULL,DateFormat.FULL,Locale.CHINA); System.out.println(df.format(new Date()));
如何获取Android系统时间是24小时制还是12小时制
ContentResolver cv = this.getContentResolver(); String strTimeFormat = android.provider.Settings.System.getString(cv, android.provider.Settings.System.TIME_12_24); if(strTimeFormat.equals("24")) { Log.i("activity","24"); } Calendar c = Calendar.getInstance(); //取得系统日期: year = c.get(Calendar.YEAR) month = c.grt(Calendar.MONTH) day = c.get(Calendar.DAY_OF_MONTH) //取得系统时间: hour = c.get(Calendar.HOUR_OF_DAY); minute = c.get(Calendar.MINUTE)
利用Calendar获取
Calendar c = Calendar.getInstance(); 取得系统日期:year = c.get(Calendar.YEAR) month = c.grt(Calendar.MONTH) day = c.get(Calendar.DAY_OF_MONTH) 取得系统时间:hour = c.get(Calendar.HOUR_OF_DAY); minute = c.get(Calendar.MINUTE) Calendar c = Calendar.getInstance(); 取得系统日期:year = c.get(Calendar.YEAR) month = c.grt(Calendar.MONTH) day = c.get(Calendar.DAY_OF_MONTH) 取得系统时间:hour = c.get(Calendar.HOUR_OF_DAY); minute = c.get(Calendar.MINUTE)
利用Time获取
Time t=new Time(); // or Time t=new Time("GMT+8"); 加上Time Zone资料。 t.setToNow(); // 取得系统时间。 int year = t.year; int month = t.month; int date = t.monthDay; int hour = t.hour; // 0-23 int minute = t.minute; int second = t.second;
计算时间差:
DateFormat df = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss"); try{ Date d1 = df.parse("2004-03-26 13:31:40"); Date d2 = df.parse("2004-01-02 11:30:24"); long diff = d1.getTime() - d2.getTime(); long days = diff / (1000 * 60 * 60 * 24); }catch (Exception e){ } 方法二: SimpleDateFormat df = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss"); java.util.Date now = df.parse("2004-03-26 13:31:40"); java.util.Date date=df.parse("2004-01-02 11:30:24"); long l=now.getTime()-date.getTime(); long day=l/(24*60*60*1000); long hour=(l/(60*60*1000)-day*24); long min=((l/(60*1000))-day*24*60-hour*60); long s=(l/1000-day*24*60*60-hour*60*60-min*60); System.out.println(""+day+"天"+hour+"小时"+min+"分"+s+"秒"); 方法三: SimpleDateFormat dfs = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss"); java.util.Date begin=dfs.parse("2004-01-02 11:30:24"); java.util.Date end = dfs.parse("2004-03-26 13:31:40"); long between=(end.getTime()-begin.getTime())/1000;//除以1000是为了转换成秒 long day1=between/(24*3600); long hour1=between%(24*3600)/3600; long minute1=between%3600/60; long second1=between%60/60; System.out.println(""+day1+"天"+hour1+"小时"+minute1+"分"+second1+"秒"); ==================================================== java 比较时间大小 String s1="2008-01-25 09:12:09"; String s2="2008-01-29 09:12:11"; java.text.DateFormat df=new java.text.SimpleDateFormat("yyyy-MM-dd HH:mm:ss"); java.util.Calendar c1=java.util.Calendar.getInstance(); java.util.Calendar c2=java.util.Calendar.getInstance(); try{ c1.setTime(df.parse(s1)); c2.setTime(df.parse(s2)); }catch(java.text.ParseException e){ System.err.println("格式不正确"); } int result=c1.compareTo(c2); if(result==0) System.out.println("c1相等c2"); else if(result<0) System.out.println("c1小于c2"); else System.out.println("c1大于c2"); //时间格式转换 FastDateFormat df = FastDateFormat.getInstance("yyyy-MM-dd HH:mm:ss"); String date = df.format(java.util.Date()