Shell使用Epoch进行日期时间转换和计算的几个小函数

核心代码

当你遇到一个date命令不给力的系统时，可以试试这几个小函数。

#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-%02dn",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:%02dn",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:%02dn",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%sn",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.%03dn",yy,mm,dd,hh,nn,ss,ms)
  }'
}
milliseconds2date 1282157959073

应用实例：