Android platform related classes and methods for time and date (Date/time)

1. The time class , which can be given a specific date/time and timezone, can be converted between a date/time format and a string and milliseconds.

(it is said that using the time class has less load on the CPU, but I have not compared it with other types)

Time t = new Time (); Get the initial date time: 19700101t000000asia/shanghai (0,0,0,-1,-28800)

Time T=new time ("gmt+8"); Add Time zone information

T.settonow (); Get current date Time: 20140103t153540asia/shanghai (5,2,28800,0,1388734540)

String str = T.format ("%y%m%dt%h%m%s"); 20140103t155737

Equivalent to the t.format2445 () method.

Parse a string in a date/time format:

T.parse ("20101010t151133");

str = t.format2445 (); 20101010t121133

If it is a string other than this format, the result throws an exception timeformatexception

T.parse ("20101010151133"); Abnormal

T.parse ("aaa201010ddt10151133ddd");//exception

T.parse ("20101010"); Only dates are normal.
Timestr = t.format2445 (); 20101010

Gets the individual domain values for time:

int year = T.year; 2010
int month = T.month; 9 (0-11) It is worth noting here
int date = T.monthday; 10
int hour = T.hour; 15, 24-hour system (0-23)
int minute = T.minute; 11
int second = T.second; 33

2. Calendar class

Dateformat.format (DateFormat, calendar) method, generally used in the format is yyyy mm DD hh mm SS, in this method, the time display is 12-hour system, if need to display 24-hour system, the HH can be replaced with KK.

String out = Dateformat.format ("Mm-dd hh:mm:ss", Calendar.getinstance (). GetTime ()). ToString (); 01-04 11:23:56
out = Dateformat.format ("Yy-mm-dd hh:mm:ss", Calendar.getinstance (). GetTime ()). ToString (); Yy-01-dd 11:25:48 (Incorrect parameters)
out = Dateformat.format ("yyyy-m-d hh:mm:ss", Calendar.getinstance (). GetTime ()). ToString (); yyyy-1-d 11:26:21 (Incorrect parameters)

out = Dateformat.format ("Yy-mm-dd hh:mm:ss", Calendar.getinstance (). GetTime ()). ToString (); 14-01-04 11:59:12
out = Dateformat.format ("yyyy-m-d hh:mm:ss", Calendar.getinstance (). GetTime ()). ToString (); 2014-1-4 03:02:53

out = Dateformat.format ("yyyy-m-d kk:mm:ss", Calendar.getinstance (). GetTime ()). ToString (); 2014-1-4 15:03:19

To get the various domain values for the calendar:

int year = Calendar.getinstance (). get (Calendar.year);
int month = Calendar.getinstance (). Get (Calendar.month) + 1;
int day = Calendar.getinstance (). get (Calendar.day_of_month);
int hour = Calendar.getinstance (). get (Calendar.hour_of_day);
int minute = Calendar.getinstance (). get (Calendar.minute);
int second = Calendar.getinstance (). get (Calendar.second);
out = String.Format ("%04d-%02d-%02d", year, month, day); 2014-01-04
out = String.Format ("%02d:%02d:%02d", hour, minute, second); 11:27:13

Get date time in local format:

out = Calendar.getinstance (). GetTime (). toLocaleString (); 2014-1-4 3:04:05

Gets the number of milliseconds for the current time of the system:

Long Currentstamp = Calendar.getinstance (). Gettimeinmillis (); 1388806099388
T.set (time);
Timestr = t.format2445 (); 20140104t112350

3. Other methods:

Gets the number of milliseconds that the non-sleep state has continued since the boot: (milliseconds of non-sleep uptime since boot.)

Long when = Systemclock.uptimemillis ();

It is more appropriate to detect a time difference in the execution of an operation or method, such as:

LOG.V ("Test Running Time", "This method costs time:" + (Systemclock.uptimemillis ()-when) + "MS");

Gets the number of milliseconds of the current time of the system, with the Time.settonow () method.

Long Time=system.currenttimemillis (); 1388803748818

T.set (time);
Timestr = t.format2445 (); 20140104t104908

Android platform related classes and methods for time and date (Date/time)