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Several small functions used by Shell to convert and calculate date and time using Epoch

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When you encounter a system where the date command is not powerful, you can try these few functions.

#Date to days
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'`
Copy code
#Days to date
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 \ n", yy, mm, dd)
    } '
}
days2date 14839
Copy code
#Date to minute
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'`
Copy code
#Minute to date
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 \ n", yy, mm, dd, hh, nn)
    } '
}
minutes2date 21369299
Copy code
#Date to seconds
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'`
Copy code
#Seconds to date
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 \ n", yy, mm, dd, hh, nn, ss)
    } '
}
seconds2date 1282157959
Copy code
#Date to millisecond
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 \ n", j, $ 7)
    } '
}
date2milliseconds `echo" 2010-08-18 18: 59: 19.073 "| sed 's /-/ / g; s /: / /g;s/\./ / g'`
Copy code
#Ms to date
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 \ n", yy, mm, dd, hh, nn, ss, ms)
    } '
}
milliseconds2date 1282157959073
Copy code
Applications:

Calculate today's date after N days


  1. #!/bin/bash
  2. function date2days {
  3.     echo "$1 $2 $3" | awk '{
  4.         z=int((14-$2)/12); y=$1+4800-z; m=$2+12*z-3;
  5.         j=int((153*m+2)/5)+$3+y*365+int(y/4)-int(y/100)+int(y/400)-2472633;
  6.         print j
  7.     }'
  8. }

  10. function days2date {
  11.     echo "$1" | awk '{
  12.         a=$1+2472632; b=int((4*a+3)/146097); c=int((-b*146097)/4)+a;
  13.         d=int((4*c+3)/1461); e=int((-1461*d)/4)+c; m=int((5*e+2)/153);
  14.         dd=-int((153*m+2)/5)+e+1; mm=int(-m/10)*12+m+3; yy=b*100+d-4800+int(m/10);
  15.         printf ("%4d%02d%02d\n",yy,mm,dd)
  16.     }'
  17. }

  19. year=`date +%Y`; month=`date +%m`; day=`date +%d`
  20. days=`date2days $year $month $day`
  21. N=5
  22. let days-=$N
  23. days2date $days
Calculate the date after N days of a day


#!/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\n",yy,mm,dd) }' } year=2010; month=01; day=20 days=`date2days $year $month $day` let days+=5 days2date $days


Calculate all dates of the previous week


  1. #!/bin/bash
  2. function date2days {
  3.     echo "$1 $2 $3" | awk '{
  4.         z=int((14-$2)/12); y=$1+4800-z; m=$2+12*z-3;
  5.         j=int((153*m+2)/5)+$3+y*365+int(y/4)-int(y/100)+int(y/400)-2472633;
  6.         print j
  7.     }'
  8. }

  10. function days2date {
  11.     echo "$1" | awk '{
  12.         a=$1+2472632; b=int((4*a+3)/146097); c=int((-b*146097)/4)+a;
  13.         d=int((4*c+3)/1461); e=int((-1461*d)/4)+c; m=int((5*e+2)/153);
  14.         dd=-int((153*m+2)/5)+e+1; mm=int(-m/10)*12+m+3; yy=b*100+d-4800+int(m/10);
  15.         printf ("%4d%02d%02d\n",yy,mm,dd)
  16.     }'
  17. }

  19. function date2week {
  20.     echo "$1 $2 $3" | awk '{
  21.         z=int((14-$2)/12); y=$1+4800-z; m=$2+12*z-3;
  22.         dow=(int((153*m+2)/5)+$3+y*365+int(y/4)-int(y/100)+int(y/400)-2472629)%7;
  23.         print dow
  24.     }'
  25. }

  27. year=`date +%Y`; month=`date +%m`; day=`date +%d`
  28. days=`date2days $year $month $day`
  29. week=`date2week $year $month $day`
  30. let dateEnd=$days-$week-1
  31. let dateBegin=$dateEnd-6
  32. for ((i=$dateBegin;i<=$dateEnd;i++)); do
  33.     days2date $i
  34. done

Convert date time to milliseconds



  1. function date2milliseconds {
  2.     echo "$*" | awk '{
  3.         z=int((14-$2)/12); y=$1+4800-z; m=$2+12*z-3;
  4.         j=int((153*m+2)/5)+$3+y*365+int(y/4)-int(y/100)+int(y/400)-2472633;
  5.         j=j*86400+$4*3600+$5*60+$6
  6.         print j$7
  7.     }'
  8. }

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

Convert date and time to seconds



  1. function date2seconds {
  2.     echo "$*" | awk '{
  3.         z=int((14-$2)/12); y=$1+4800-z; m=$2+12*z-3;
  4.         j=int((153*m+2)/5)+$3+y*365+int(y/4)-int(y/100)+int(y/400)-2472633;
  5.         j=j*86400+$4*3600+$5*60+$6
  6.         print j
  7.     }'
  8. }

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

Determine if a number is a legal date



  1. function date2days {
  2.     echo "$*" | awk '{
  3.         z=int((14-$2)/12); y=$1+4800-z; m=$2+12*z-3;
  4.         j=int((153*m+2)/5)+$3+y*365+int(y/4)-int(y/100)+int(y/400)-2472633;
  5.         print j
  6.     }'
  7. }

  9. function days2date {
  10.     echo "$1" | awk '{
  11.         a=$1+2472632; b=int((4*a+3)/146097); c=int((-b*146097)/4)+a;
  12.         d=int((4*c+3)/1461); e=int((-1461*d)/4)+c; m=int((5*e+2)/153);
  13.         dd=-int((153*m+2)/5)+e+1; mm=int(-m/10)*12+m+3; yy=b*100+d-4800+int(m/10);
  14.         printf ("%4d%02d%02d\n",yy,mm,dd)
  15.     }'
  16. }

  18. num1=20105050
  19. num2=20101001
  20. arg1=`echo "$num1" | sed -r 's/(....)(..)(..)/\1 \2 \3/g'`
  21. arg2=`echo "$num2" | sed -r 's/(....)(..)(..)/\1 \2 \3/g'`
  22. days1=`date2days $arg1`
  23. date1=`days2date $days1`
  24. days2=`date2days $arg2`
  25. date2=`days2date $days2`
  26. [ "$num1" -eq "$date1" ] && echo "$num1 is valid date" || echo "$num1 is invalid date"
  27. [ "$num2" -eq "$date2" ] && echo "$num2 is valid date" || echo "$num2 is invalid date"

Calculate the time before 10 minutes



  1. function date2minutes {
  2.     echo "$*" | awk '{
  3.         z=int((14-$2)/12); y=$1+4800-z; m=$2+12*z-3;
  4.         j=int((153*m+2)/5)+$3+y*365+int(y/4)-int(y/100)+int(y/400)-2472633;
  5.         j=j*1440+$4*60+$5
  6.         print j
  7.     }'
  8. }
  9. function minutes2date {
  10.     echo "$1" | awk '{
  11.         i=$1; nn=i%60; i=int(i/60); hh=i%24; dd=int(i/24); i=int(i/24);
  12.         a=i+2472632; b=int((4*a+3)/146097); c=int((-b*146097)/4)+a;
  13.         d=int((4*c+3)/1461); e=int((-1461*d)/4)+c; m=int((5*e+2)/153);
  14.         dd=-int((153*m+2)/5)+e+1; mm=int(-m/10)*12+m+3; yy=b*100+d-4800+int(m/10);
  15.         printf ("%4d-%02d-%02d %02d:%02d\n",yy,mm,dd,hh,nn)
  16.     }'
  17. }

  19. now=`date "+%Y-%m-%d %H:%M" | sed 's/-/ /g;s/:/ /g'`
  20. minutes=`date2minutes $now`
  21. let minutes-=10
  22. minutes2date $minutes

Calculate the number of days between the specified date and the current system date



  1. #!/bin/bash
  2. function date2days {
  3.     echo "$*" | awk '{
  4.         z=int((14-$2)/12); y=$1+4800-z; m=$2+12*z-3;
  5.         j=int((153*m+2)/5)+$3+y*365+int(y/4)-int(y/100)+int(y/400)-2472633;
  6.         print j
  7.     }'
  8. }

  10. echo "Enter your date:"
  11. read input
  12. InpuDays=$(date2days ${input:0:4} ${input:4:2} ${input:6:2})
  13. SysDays=$(date2days `date +"%Y %m %d"`)
  14. let result=$InpuDays-$SysDays
  15. echo $result

Monday's date last week
  1. #!/bin/bash
  2. function date2days {
  3.     echo "$1 $2 $3" | awk '{
  4.         z=int((14-$2)/12); y=$1+4800-z; m=$2+12*z-3;
  5.         j=int((153*m+2)/5)+$3+y*365+int(y/4)-int(y/100)+int(y/400)-2472633;
  6.         print j
  7.     }'
  8. }

  10. function days2date {
  11.     echo "$1" | awk '{
  12.         a=$1+2472632; b=int((4*a+3)/146097); c=int((-b*146097)/4)+a;
  13.         d=int((4*c+3)/1461); e=int((-1461*d)/4)+c; m=int((5*e+2)/153);
  14.         dd=-int((153*m+2)/5)+e+1; mm=int(-m/10)*12+m+3; yy=b*100+d-4800+int(m/10);
  15.         printf ("%4d%02d%02d\n",yy,mm,dd)
  16.     }'
  17. }

  19. function date2week {
  20.     echo "$1 $2 $3" | awk '{
  21.         z=int((14-$2)/12); y=$1+4800-z; m=$2+12*z-3;
  22.         dow=(int((153*m+2)/5)+$3+y*365+int(y/4)-int(y/100)+int(y/400)-2472629)%7;
  23.         print dow
  24.     }'
  25. }

  27. year=`date +%Y`; month=`date +%m`; day=`date +%d`
  28. days=`date2days $year $month $day`
  29. week=`date2week $year $month $day`
  30. let date=$days-$week-7
  31. days2date $date



This article is an English version of an article which is originally in the Chinese language on aliyun.com and is provided for information purposes only. This website makes no representation or warranty of any kind, either expressed or implied, as to the accuracy, completeness ownership or reliability of the article or any translations thereof. If you have any concerns or complaints relating to the article, please send an email, providing a detailed description of the concern or complaint, to info-contact@alibabacloud.com. A staff member will contact you within 5 working days. Once verified, infringing content will be removed immediately.

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