問題描述
我必須根據日歷的日期計算一些東西，但我收到了完整的公歷字符串值.
I have to compute something based on the Calendar's date, but I am receiving the complete Gregorian Calendar's String value.
例如 i/p 收到 {may be - "new GregorianCalendar().toString()"} as String :- java.util.GregorianCalendar[time=1410521241348,areFieldsSet=true,areAllFieldsSet=true,lenient=true,zone=sun.util.calendar.ZoneInfo[id="Europe/London",offset=0,dstSavings=3600000,useDaylight=true,transitions=242,lastRule=java.util.SimpleTimeZone[id=Europe/London,offset=0,dstSavings=3600000,useDaylight=true,startYear=0,startMode=2,startMonth=2,startDay=-1,startDayOfWeek=1,startTime=3600000,startTimeMode=2,endMode=2,endMonth=9,endDay=-1,endDayOfWeek=1,endTime=3600000,endTimeMode=2]],firstDayOfWeek=1,minimalDaysInFirstWeek=1,ERA=1,YEAR=2014,MONTH=8,WEEK_OF_YEAR=37,WEEK_OF_MONTH=2,DAY_OF_MONTH=12,DAY_OF_YEAR=255,DAY_OF_WEEK=6,DAY_OF_WEEK_IN_MONTH=2,AM_PM=1,HOUR=0,HOUR_OF_DAY=12,MINUTE=27,SECOND=21,MILLISECOND=348,ZONE_OFFSET=0,DST_OFFSET=3600000]
我想提取日歷的日期值來處理進一步的計算.
I want to extract the Calendar's date value to process further computation.
推薦答案
其他答案太復雜或錯誤.以下將為您提供自紀元以來的毫秒，這是一個通用時間戳，您可以輕松地將其轉換為大多數時間表示類，包括 Calendar 或 Date:
Other answers are too complicated or wrong. The following will give you the milliseconds since the epoch, which is a universal timestamp that you can easily convert to most time representation classes, including Calendar or Date:
Pattern gregorianPattern = Pattern.compile("^java.util.GregorianCalendar\[time=(\d+).*");
Matcher matcher = gregorianPattern.matcher(param);
if(matcher.matches()) {
return Long.parseLong(matcher.group(1));
}
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