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Day of the week from a string

 
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# 1  
Old 04-08-2010
Day of the week from a string
Hi All,

I need to know how to derive the day of the week by passing the value in following format:

Feb 28 2010

The output I'm expecting is Sunday or Sun.

I know, I can use the following code to get the day of the week.
Code:
date +%a

But I want to pass the value as a string. Please help and we don't have GNU installed.

Thanks
Shash
# 2  
Old 04-08-2010
Your post seems unclear (at least to me) on what exactly you are trying to achieve. What OS you are working with, and what's the default output of 'date' command ? For example, I can print the first element of my output quite easily :
Code:
date | awk '{print $1}'

# 3  
Old 04-08-2010
something to start with:
Code:
#!/bin/ksh

date='Aug 1 2010'

eval $(echo "${date}" | nawk 'BEGIN {split("JAN|FEB|MAR|APR|MAY|JUN|JUL|AUG|SEP|OCT|NOV|DEC", tA, "|");while(++i in tA) monA[tA[i]]=i}{printf("year=%s month=%s day=%s\n", $3, monA[toupper($1)], $2)}')
echo "year->[${year}] month->[${month}] day->[${day}]"

cal "${month}" "${year}" | nawk -v day="${day}" '
  FNR==2 {split("Sun|Mon|Tue|Wed|Thu|Fri|Sat", daysA, "|")}
  FNR > 2 {
    for(i=1; i <= NF; i++)
      if ( $i == day) {
        printf("%s\n", (NF == 7 || FNR!=3) ? daysA[i] : days[i+(6-NF)+1])
        exit
      }
  }
'

Last edited by vgersh99; 04-08-2010 at 12:22 PM.. Reason: abbreviated day names
# 4  
Old 04-08-2010
Thanks vgersh99. I think it is working fine except it is just printing the first character. I mean for Sunday, the output is just S. Can you please let me know how to print atleast first 3 characters.

Thanks
Shash
# 5  
Old 04-08-2010
Quote:
Originally Posted by shash
Thanks vgersh99. I think it is working fine except it is just printing the first character. I mean for Sunday, the output is just S. Can you please let me know how to print atleast first 3 characters.

Thanks
Shash
Edited the original post - this assumes the week in your locale starts on Sunday. Change the line in red if/when needed to account for your locale specifics.
# 6  
Old 04-08-2010
Thanks a lot. It is working fine.
# 7  
Old 04-08-2010
This will display the abreviated day of the week
Code:
date -d "Feb 28 2010" +%a

This will display the full day of the week
Code:
date -d "Feb 28 2010" +%A

This will display the numeric day of the week (mon=1, sun=7)
Code:
date -d "Feb 28 2010" +%u

This will display the numeric day of the week (sun=0, sat=6)
Code:
date -d "Feb 28 2010" +%w

 
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