Splitting week start date and end date based on custom period start dates Post: 303044387

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Top Forums UNIX for Beginners Questions & Answers Splitting week start date and end date based on custom period start dates Post 303044387 by RudiC on Thursday 20th of February 2020 07:11:58 AM

02-20-2020

Registered User

Given the input is exactly as given in post #1, i.e. no more nor less than three weeks between the two period dates, try (running awk thrice and date twice only, and opening / reading file twice as well)

Code:

awk '
NR > 1 {print $1 ORS $2}
' file |
date -f- +"%s %u" |
awk '
BEGIN   {SECDAY = 86400
         SEC6DY = SECDAY * 6
        }

        {WSD = $1
         WED = WSD + (7 - $2) * SECDAY
         getline
         print "@" WSD
         while (WED < $1)       {print "@" WED
                                 WSD = WED + SECDAY
                                 WED = WSD + SEC6DY
                                 print "@" WSD 
                                }
         print "@" $1
 }' |
date -f- +"%Y-%m-%d" |
awk '
BEGIN           {getline LN < "file"
                 print "week Start Date", "Week End Date", LN
                } 
                
NR%6 == 1       {getline LN < "file"
                } 
                {getline TMP
                 print $0, TMP, LN
                }
' OFS="\t" 
week Start Date Week End Date period_start_date    period_end_date    period_code
2020-01-01    2020-01-05    2020-01-01    2020-01-15    P1
2020-01-06    2020-01-12    2020-01-01    2020-01-15    P1
2020-01-13    2020-01-15    2020-01-01    2020-01-15    P1
2020-01-05    2020-01-05    2020-01-05    2020-01-19    P2
2020-01-06    2020-01-12    2020-01-05    2020-01-19    P2
2020-01-13    2020-01-19    2020-01-05    2020-01-19    P2
2020-01-16    2020-01-19    2020-01-16    2020-01-31    P1
2020-01-20    2020-01-26    2020-01-16    2020-01-31    P1
2020-01-27    2020-01-31    2020-01-16    2020-01-31    P1
.
.
 .

The first awk prints periods' start and end alternately, then date converts that entire input stream to epoch seconds and day of week line by line, then awk produces three weeks' start and end dates totaling in 6 epoch seconds per input line, then date converts those back to the desired date format, and awk merges these with the original input file.

Last edited by RudiC; 02-20-2020 at 08:22 AM..

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dp

DP(8)                                                                [nmh-1.5]                                                               DP(8)

NAME

       dp - parse dates 822-style

SYNOPSIS

       /usr/lib/mh/dp [-form formatfile] [-format string] [-width columns] [-version] [-help] dates ...

DESCRIPTION

       Dp  is  a  program that parses dates according to the ARPA Internet standard.  It also understands many non-standard formats, such as those
       produced by TOPS-20 sites and some UNIX sites using ctime(3).  It is useful for seeing how nmh will interpret a date.

       The dp program treats each argument as a single date, and prints the date out in the official 822-format.  Hence, it  is  usually  best  to
       enclose each argument in quotes for the shell.

       To  override  the  output  format  used by dp, the -format string or -format file switches are used.  This permits individual fields of the
       address to be extracted with ease.  The string is simply a format string and the file is simply a format file.  See  mh-format(5)  for  the
       details.

       Here is the default format string used by dp:

            %<(nodate{text})error: %{text}%|%(putstr(pretty{text}))%>

       which  says  that  if an error was detected, print the error, a `:', and the date in error.  Otherwise, output the 822-proper format of the
       date.

FILES

       $HOME/.mh_profile          The user profile

PROFILE COMPONENTS

       None

SEE ALSO

       ap(8), Standard for the Format of ARPA Internet Text Messages (RFC-822)

DEFAULTS

       `-format' default as described above
       `-width' default to the width of the terminal

CONTEXT

       None

BUGS

       The argument to the -format switch must be interpreted as a single token by the shell that invokes dp.  Therefore, one must  usually  place
       the argument to this switch inside quotes.

MH.6.8                                                             11 June 2012                                                              DP(8)