Shell使用Epoch进行日期时间转换和计算的几个小函数

计算今天的N天之后的日期

#!/bin/bash
function date2days {
  echo "$1 $2 $3" | awk '{
    z=int((14-$2)/12); y=$1+4800-z; m=$2+12*z-3;
    j=int((153*m+2)/5)+$3+y*365+int(y/4)-int(y/100)+int(y/400)-2472633;
    print j
  }'
}

function days2date {
  echo "$1" | awk '{
    a=$1+2472632; b=int((4*a+3)/146097); c=int((-b*146097)/4)+a; 
    d=int((4*c+3)/1461); e=int((-1461*d)/4)+c; m=int((5*e+2)/153);
    dd=-int((153*m+2)/5)+e+1; mm=int(-m/10)*12+m+3; yy=b*100+d-4800+int(m/10);
    printf ("%4d%02d%02dn",yy,mm,dd)
  }'
}

year=`date +%Y`; month=`date +%m`; day=`date +%d`
days=`date2days $year $month $day`
N=5
let days-=$N
days2date $days

计算某天的N天之后的日期

#!/bin/bash
function date2days {
  echo "$1 $2 $3" | awk '{
    z=int((14-$2)/12); y=$1+4800-z; m=$2+12*z-3;
    j=int((153*m+2)/5)+$3+y*365+int(y/4)-int(y/100)+int(y/400)-2472633;
    print j
  }'
}

function days2date {
  echo "$1" | awk '{
    a=$1+2472632; b=int((4*a+3)/146097); c=int((-b*146097)/4)+a; 
    d=int((4*c+3)/1461); e=int((-1461*d)/4)+c; m=int((5*e+2)/153);
    dd=-int((153*m+2)/5)+e+1; mm=int(-m/10)*12+m+3; yy=b*100+d-4800+int(m/10);
    printf ("%4d%02d%02dn",yy,mm,dd)
  }'
}

year=2010; month=01; day=20
days=`date2days $year $month $day`
let days+=5
days2date $days

计算上一个星期的全部日期

#!/bin/bash
function date2days {
  echo "$1 $2 $3" | awk '{
    z=int((14-$2)/12); y=$1+4800-z; m=$2+12*z-3;
    j=int((153*m+2)/5)+$3+y*365+int(y/4)-int(y/100)+int(y/400)-2472633;
    print j
  }'
}

function days2date {
  echo "$1" | awk '{
    a=$1+2472632; b=int((4*a+3)/146097); c=int((-b*146097)/4)+a; 
    d=int((4*c+3)/1461); e=int((-1461*d)/4)+c; m=int((5*e+2)/153);
    dd=-int((153*m+2)/5)+e+1; mm=int(-m/10)*12+m+3; yy=b*100+d-4800+int(m/10);
    printf ("%4d%02d%02dn",yy,mm,dd)
  }'
}

function date2week {
  echo "$1 $2 $3" | awk '{
    z=int((14-$2)/12); y=$1+4800-z; m=$2+12*z-3;
    dow=(int((153*m+2)/5)+$3+y*365+int(y/4)-int(y/100)+int(y/400)-2472629)%7;
    print dow
  }'
}

year=`date +%Y`; month=`date +%m`; day=`date +%d`
days=`date2days $year $month $day`
week=`date2week $year $month $day`
let dateEnd=$days-$week-1
let dateBegin=$dateEnd-6
for ((i=$dateBegin;i<=$dateEnd;i++)); do
  days2date $i
done

日期时间转换成毫秒

function date2milliseconds {
  echo "$*" | awk '{
    z=int((14-$2)/12); y=$1+4800-z; m=$2+12*z-3;
    j=int((153*m+2)/5)+$3+y*365+int(y/4)-int(y/100)+int(y/400)-2472633;
    j=j*86400+$4*3600+$5*60+$6
    print j$7
  }'
}

date2milliseconds `echo "2010-08-18 18:59:19.073" | /usr/xpg4/bin/awk -F'[:.-]+' '$1=$1'`

日期时间转换成秒

function date2seconds {
  echo "$*" | awk '{
    z=int((14-$2)/12); y=$1+4800-z; m=$2+12*z-3;
    j=int((153*m+2)/5)+$3+y*365+int(y/4)-int(y/100)+int(y/400)-2472633;
    j=j*86400+$4*3600+$5*60+$6
    print j
  }'
}

date2seconds `echo "2010-07-21 00:00:00" | sed 's/-/ /g;s/:/ /g'`								 
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