Java 我在（字符串）中有一个 dd-mon-yyyy 格式的日期，我想将此日期与系统日期进行比较
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I have a date in(string) in dd-mon-yyyy format and I want to compare this date with system date
提问by Sanjeev
I have a date in(string) in dd-mon-yyyy format and I want to compare this date with system date.
我有一个 dd-mon-yyyy 格式的日期 in(string)，我想将此日期与系统日期进行比较。
eg. I have 12-OCT-2010 and I want to compere this with system date in same format
例如。我有 12-OCT-2010，我想以相同的格式将其与系统日期进行比较
采纳答案by Jon Freedman
You can use the SystemDateFormatclass to parse your String, for example
例如，您可以使用SystemDateFormat该类来解析您的字符串
final DateFormat fmt = new SimpleDateFormat("dd-MMM-yyyy");
final Date input = fmt.parse("12-OCT-2010");
if (input.before(new Date()) {
// do something
}
Note that SimpleDateFormatis not threadsafe, so needs to be wrapped in a ThreadLocalif you have more than one thread accessing your code.
请注意，这SimpleDateFormat不是线程安全的，因此ThreadLocal如果您有多个线程访问您的代码，则需要将其包装在 a 中。
You may also be interested in Joda, which provides a better date API
您可能还对Joda感兴趣，它提供了更好的日期 API
回答by dty
I would recommend using Joda Time. You can parse that String into a LocalDateobject very simply, and then construct another LocalDatefrom the system clock. You can then compare these dates.
我建议使用 Joda Time。您可以LocalDate非常简单地将该字符串解析为一个对象，然后LocalDate根据系统时钟构造另一个对象。然后您可以比较这些日期。
回答by Kevin D
Use SimpleDateFormat http://download.oracle.com/javase/6/docs/api/java/text/SimpleDateFormat.html
使用 SimpleDateFormat http://download.oracle.com/javase/6/docs/api/java/text/SimpleDateFormat.html
SimpleDateFormat f = new SimpleDateFormat("dd-MMM-yyyy");
String d = "12-OCT-2010";
try {
Date formatted = f.parse(d);
Date sysDate = new Date();
System.out.println(formatted);
System.out.println(sysDate);
if(formatted.before(sysDate)){
System.out.println("Formatted Date is older");
}
} catch (ParseException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
回答by Johnbabu Koppolu
Using simpledateformat -
使用 simpledateformat -
String df = "dd-MMM-yyyy";
SimpleDateFormat sdf = new SimpleDateFormat(df);
Calendar cal = Calendar.getInstance();
/* system date */
String systemdate = sdf.format(cal.getTime());
/* the date you want to compare in string format */
String yourdate = "12-Oct-2010";
Date ydate = null;
try {
ydate = sdf.parse(yourdate);
} catch (ParseException e) {
e.printStackTrace();
}
yourdate = sdf.format(ydate);
System.out.println(systemdate.equals(yourdate) ? "true" : "false");
