Linux date自己实现代码

日期转天数

function date2days {
    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;
        print j
    }'
}
date2days `echo "2010-08-18 18:59:19" | sed 's/-/ /g;s/:/ /g'`

　天数转日期

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-%02d
",yy,mm,dd)
    }'
}
days2date 14839

日期转分钟

function date2minutes {
    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*1440+$4*60+$5
        print j
    }'
}
date2minutes `echo "2010-08-18 18:59:19" | sed 's/-/ /g;s/:/ /g'`

分钟转日期

function minutes2date {
    echo "$1" | awk '{
        i=$1; nn=i%60; i=int(i/60); hh=i%24; dd=int(i/24); i=int(i/24);
        a=i+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-%02d %02d:%02d
",yy,mm,dd,hh,nn)
    }'
}
minutes2date 21369299

日期转秒数

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 "2010-08-18 18:59:19" | sed 's/-/ /g;s/:/ /g'`

秒数转日期

function seconds2date {
    echo "$1" | awk '{
        i=$1; ss=i%60; i=int(i/60); nn=i%60; i=int(i/60); hh=i%24; dd=int(i/24); i=int(i/24);
        a=i+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-%02d %02d:%02d:%02d
",yy,mm,dd,hh,nn,ss)
    }'
}
seconds2date 1282157959

日期转毫秒

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
        printf ("%d%s
",j,$7)
    }'
}
date2milliseconds `echo "2010-08-18 18:59:19.073" | sed 's/-/ /g;s/:/ /g;s/./ /g'`

毫秒转日期

function milliseconds2date {
    echo "$1" | awk '{
        i=$1; ms=i%1000; i=int(i/1000); ss=i%60; i=int(i/60); nn=i%60; i=int(i/60); hh=i%24; dd=int(i/24); 

i=int(i/24);
        a=i+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-%02d %02d:%02d:%02d.%03d
",yy,mm,dd,hh,nn,ss,ms)
    }'
}
milliseconds2date 1282157959073

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%02d
",yy,mm,dd)
    }'
}

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

　　

　其他：http://bbs.chinaunix.net/thread-1772999-1-1.html