Java date formatting converts a gmt,gst date of type string to date type

In the actual development process will often need to encapsulate the date type of data in XML or JSON format on the network for transmission, in addition, when the date type of data stored in the SQLite database and then fetched only the date of the string type, because SQLite is untyped. This has to do with the problem of converting a date of type string to date type. Here's how to convert a string-type GMT, GST date to a Date object.

You can use Newdate ("") to convert a date of type string to an object of date type before JDK1.1. But since the beginning of JDK1.1 it is not recommended to do so. The following is an introduction to using the SimpleDateFormat class to convert a date of type string to date object.

SimpleDateFormat 类的概述：

SimpleDateFormatis a specific class that formats and resolves dates in a language-related way. It allows formatting (date-and text), parsing (text-to-date), and normalization.

SimpleDateFormatAllows you to select any user-defined pattern of date-time formats.

Date and Time mode

Date and time formats are specified by a date and time pattern string. In the date and time pattern strings, the unquoted letters ' a ' to ' Z ' and ' a ' to ' Z ' are interpreted as pattern letters, which are used to represent date or time string elements. Text can be caused by using single quotation marks (') to avoid interpretation. "'" denotes single quotation marks. All other characters are not interpreted; Simply copy them to the output string when they are formatted, or match the input string when parsing.

The following pattern letters are defined (all other characters ' a ' to ' Z ' and ' a ' to ' Z ' are preserved):

Letters	Date or time element	Said	Example
G	Era Marker	Text	AD
Y	Years	Year	1996; 96
M	Month of the Year	Month	July; Jul; 07
W	Number of weeks in the year	Number	27
W	Number of weeks in the month	Number	2
D	Number of days in the year	Number	189
D	Number of days in month	Number	10
F	Week of the Month	Number	2
E	Days of the Week	Text	Tuesday; Tue
A	AM/PM Mark	Text	Pm
H	Number of hours in the day (0-23)	Number	0
K	Number of hours in the day (1-24)	Number	24
K	Number of hours in am/pm (0-11)	Number	0
H	Number of hours in am/pm (1-12)	Number	12
M	Number of minutes in hours	Number	30
S	Number of seconds in minutes	Number	55
S	Number of milliseconds	Number	978
Z	Time	General Time Zone	Pacific Standard Time; PST; gmt-08:00
Z	Time	RFC 822 Time Zone	-0800

Example

The following example shows how to interpret the date and time patterns in the U.S. locale. Given the date and time of the United States Pacific Time zone for local time 2001-07-04 12:08:56.

Date and Time mode	Results
"YYYY. Mm.dd G ' at ' HH:mm:ss z '	2001.07.04 AD at 12:08:56 PDT
"EEE, MMM D, ' yy"	Wed, Jul 4, ' 01
"H:mm a"	12:08 PM
"HH ' o ' clock ' A, zzzz"	O ' clock PM, Pacific Daylight Time
"K:mm A, z"	0:08 PM, PDT
"Yyyyy. MMMMM.DD GGG hh:mm AAA "	02001.july.04 AD 12:08 PM
"EEE, D MMM yyyy HH:mm:ss Z"	Wed, 4 Jul 2001 12:08:56-0700
"Yymmddhhmmssz"	010704120856-0700
"Yyyy-mm-dd ' T ' HH:mm:ss. Sssz "	2001-07-04t12:08:56.235-0700

Converts a String type GMT, GST date to a Date object

String stringdate = "Thu Oct 07:13:48 GMT 2014";

SimpleDateFormat SDF = newsimpledateformat ("EEE MMM ddHH:mm:ss ' GMT ' yyyy", Locale. US);

Date Date =sdf.parse (stringdate);

System.out.println (Date.tostring ());

sdf=NewSimpleDateFormat ("Yyyy-mm-ddhh:mm:ss");

System. out. println (Sdf.format (date));

Code Analysis:

When instantiating the SimpleDateFormat class, you need to specify two parameters, the first parameter is the date pattern to parse, and the second parameter is the locale of the specified language. At some point the second parameter can be omitted, but the second parameter needs to be specified as locale when parsing the GMT or GST date of type string. US or locale. UK or locale. English Otherwise a compilation error will occur.

About the first parameter date pattern is to be resolved according to the string type date format is different, where the Eee represents the week, MMM for the month, DD for the day, HH for the hour, mm for minutes, SS for the second, here to pay special attention to the ' GMT ', It represents the time that you want to parse the string in GMT format, if the GST format can use ' GST ' instead of ' GMT '.

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Java date formatting converts a gmt,gst date of type string to date type