如何将公历字符串转换为公历?

问题描述

我必须根据日历的日期计算一些东西，但我收到了完整的公历字符串值.

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]

我想提取日历的日期值来处理进一步的计算.

I want to extract the Calendar's date value to process further computation.

推荐答案

其他答案太复杂或错误.以下将为您提供自纪元以来的毫秒，这是一个通用时间戳，您可以轻松地将其转换为大多数时间表示类，包括 Calendar 或 Date:

Pattern gregorianPattern = Pattern.compile("^java.util.GregorianCalendar\[time=(\d+).*"); 

Matcher matcher = gregorianPattern.matcher(param);
if(matcher.matches()) {
    return Long.parseLong(matcher.group(1));
}