Java SimpleDateFormat time format conversion in Chinese and English

SimpleDateFormat is a specific class that formats and parses dates in a language-related way. It allows formatting (date-and text), parsing (text-to-date), and normalization.
SimpleDateFormat allows you to select any user-defined pattern of date-time formats. However, it is still recommended to pass the gettimeinstance,getdateinstance , or getdatetimeinstance in dateformat To create a date-time formatter. Each of these class methods can return a date/time formatter initialized in the default format pattern. You can use the Applypattern method to modify the format pattern as needed.

Date and Time mode

Letters	date or time element	represents	Example
G	Era	Marker	Text
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

SimpleDateFormatHow to use

Depending on the "date and time pattern" above, setting the pattern that needs to be matched, you can implement a string with the date type, for example:

The time of type string is converted to date type time, and several commonly used time format conversions are as follows:

A. Time format: "2015-08-28", Mode: "Yyyy-mm-dd"

new SimpleDateFormat("yyyy-MM-dd");Date date = dateFormat.parse("2015-08-28");

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B. Time format: "2015-08-28 18:28:30", Mode: "Yyyy-mm-dd HH:mm:ss"

new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");Date date = dateFormat.parse("2015-08-28 18:28:30");

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C. Time format: "2015-8-28", Mode: "Yyyy-m-d"

new SimpleDateFormat("yyyy-M-d");Date date = dateFormat.parse("2015-8-28");

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D. Time format: "2015-8-28 18:8:30", Mode: "Yyyy-m-d h:m:s"

new SimpleDateFormat("yyyy-M-d H:m:s");Date date = dateFormat.parse("2015-8-28 18:8:30");

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E. Time format: "6:8:30 PM", Mode: "MMM d, yyyy h:m:s AA"

new SimpleDateFormat("MMM d, yyyy h:m:s aa", Locale.ENGLISH);Date date = dateFormat.parse("Aug 28, 2015 6:8:30 PM");

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F. Time format: "Fri 18:08:30 CST 2015", Mode: "EEE MMM D HH:mm:ss ' CST ' yyyy"

new SimpleDateFormat("EEE MMM d HH:mm:ss ‘CST‘ yyyy", Locale.ENGLISH);Date date = dateFormat.parse("Fri Aug 28 18:08:30 CST 2015");

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Date type time converted to string type time

This is the inverse of "string type time converted to date type Time", as long as the date date = Dateformat.parse ([string time]); Change to String date = Dateformat.format ([date type Time]); Can. For example, the current time is formatted as [yyyy years M D Day ] in the form of:

new SimpleDateFormat("yyyy年M月d日");String date = dateFormat.format(new Date());

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Note: When we do time format conversion, we mainly find the pattern of matching time format, in addition, the English format time conversion needs to take locale.english, otherwise it will fail, because it defaults to localized settings, unless your operating system is in English, In summary time conversion requires a time format that is consistent with the pattern.

Java SimpleDateFormat time format conversion in Chinese and English