How does Java verify that the time format is correct?
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In many scenarios, we need to verify that the time and date is in the correct format and that the time is regular.
1. Verify the date in yyyy-MM-dd HH:mm:dd format
String date = "2020-01-25 12:36:45"; System.out.println ("date" + isLegalDate (date.length (), date, "yyyy-MM-dd HH:mm:ss"))
2. Verify the date in yyyy-MM-dd format
String yearMonthday = "2020-01-01"; System.out.println ("yearMonthday:" + isLegalDate (yearMonthday.length (), yearMonthday, "yyyy-MM-dd"))
3. Verify the date in yyyy-MM format
String yearMonth = "2020-02"; System.out.println ("yearMonth:" + isLegalDate (yearMonth.length (), yearMonth, "yyyy-MM"))
4. Verify the date in yyyy format
String year = "2020"; System.out.println ("year:" + isLegalDate (year.length (), year, "yyyy"))
5. Verify the date in HH:mm:ss format
String hms = "12:36:89"; System.out.println ("hms:" + isLegalDate (hms.length (), hms, "HH:mm:ss"))
6. Here is a complete method class that can be run directly to verify whether the date format is correct.
Package com.shucha.deveiface.biz.test; import java.text.DateFormat;import java.text.SimpleDateFormat;import java.util.Date / * * @ author tqf * @ Description time format check * @ Version 1.0 * @ since 2020-09-15 16:49 * / public class IsLegalDate {public static void main (String [] args) {/ / 1, date of verification yyyy-MM-dd HH:mm:dd format String date = "2020-01-25 12:36:45" System.out.println ("date" + isLegalDate (date.length (), date, "yyyy-MM-dd HH:mm:ss"); / 2. Verify the date in yyyy-MM-dd format String yearMonthday = "2020-01-01"; System.out.println ("yearMonthday:" + isLegalDate (yearMonthday.length (), yearMonthday, "yyyy-MM-dd")) / / 3. Verify the date in yyyy-MM format String yearMonth = "2020-02"; System.out.println ("yearMonth:" + isLegalDate (yearMonth.length (), yearMonth, "yyyy-MM")); / / 4. Verify the date in yyyy format String year = "2020"; System.out.println ("year:" + isLegalDate (year.length (), year, "yyyy")) } / * check whether it is correct according to time and time format * @ length of param length check * @ date of param sDate check * @ format of param format check * @ return * / public static boolean isLegalDate (int length, String sDate,String format) {int legalLen = length If ((sDate = = null) | | (sDate.length ()! = legalLen)) {return false;} DateFormat formatter = new SimpleDateFormat (format); try {Date date = formatter.parse (sDate); return sDate.equals (formatter.format (date));} catch (Exception e) {return false;}
The following is a screenshot after time verification
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