常用时间处理和转换

当前时间

from datetime import datetime
t_now = datetime.now()

时间取整

应该把时间转换为时间戳

时间对象

Python2 是 datetime 对象

import time
from datetime import datetime, timedelta
ts_now = time.mktime(t_now.timetuple())
t_block = datetime.fromtimestamp(ts_now - ts_now % 300)

时间戳格式化

Python2

d_now_ft = t_now.strftime('%Y%m%d')
t_block_ft = t_block.strftime('%Y-%m-%d %H:%M:%S')

时间字符串解析

Java

    public static Date strToDate(String dateTimeStr,String formatStr){
        DateTimeFormatter dateTimeFormatter = DateTimeFormat.forPattern(formatStr);
        DateTime dateTime = dateTimeFormatter.parseDateTime(dateTimeStr);
        return dateTime.toDate();
    }

    public static String dateToStr(Date date,String formatStr){
        if(date == null){
            return StringUtils.EMPTY;
        }
        DateTime dateTime = new DateTime(date);
        return dateTime.toString(formatStr);
    }

    static public DateTimeFormatter dtFormater = 
        DateTimeFormat.forPattern("yyyyMMdd").withZone(DateTimeZone.forOffsetHours(8));