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Operating Systems Solaris Convert string (YYYYMMDD) format to date in Sun OS Post 303015096 by wisecracker on Tuesday 27th of March 2018 05:26:07 PM
Old 03-27-2018
Try a Python approach through bash.
Code:
#!/bin/bash
# epoch.sh
# Usage: ./epoch.sh YYYYMMDD
EPOCH=$1
if [ "$EPOCH" == "" ]
then
	exit 1
fi
echo '#epoch.py
import time
mydate='\"$EPOCH\"'
epoch=int(time.mktime(time.strptime(mydate, "%Y%m%d")))
print(time.strftime("%A", time.localtime(epoch)))
exit()' > "$HOME"/epoch.py
DAY=$( python "$HOME"/epoch.py )
echo "$DAY"

Results OSX 10.13.3, default bash terminal calling Python 2.7.x.
Code:
Last login: Tue Mar 27 22:13:36 on ttys000
AMIGA:amiga~> cd Desktop/Code/Shell
AMIGA:amiga~/Desktop/Code/Shell> ./epoch.sh 20180327
Tuesday
AMIGA:amiga~/Desktop/Code/Shell> ./epoch.sh 20180328
Wednesday
AMIGA:amiga~/Desktop/Code/Shell> _

Note: There is very linited error checking so beware!
EDIT:
This is Python 2.7.10 but I think it works on Python 3.5.2 also.
(I have bent the rules on the Python print statement in 2.7.x AND print() function in 3.5.x...)

Last edited by wisecracker; 03-27-2018 at 06:37 PM.. Reason: See above.
 

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FUNCTION::CTIME(3stap)					      Time utility functions					    FUNCTION::CTIME(3stap)

NAME
function::ctime - Convert seconds since epoch into human readable date/time string SYNOPSIS
ctime:string(epochsecs:long) ARGUMENTS
epochsecs Number of seconds since epoch (as returned by gettimeofday_s) DESCRIPTION
Takes an argument of seconds since the epoch as returned by gettimeofday_s. Returns a string of the form "Wed Jun 30 21:49:08 1993" The string will always be exactly 24 characters. If the time would be unreasonable far in the past (before what can be represented with a 32 bit offset in seconds from the epoch) an error will occur (which can be avoided with try/catch). If the time would be unreasonable far in the future, an error will also occur. Note that the epoch (zero) corresponds to "Thu Jan 1 00:00:00 1970" The earliest full date given by ctime, corresponding to epochsecs -2147483648 is "Fri Dec 13 20:45:52 1901". The latest full date given by ctime, corresponding to epochsecs 2147483647 is "Tue Jan 19 03:14:07 2038". The abbreviations for the days of the week are 'Sun', 'Mon', 'Tue', 'Wed', 'Thu', 'Fri', and 'Sat'. The abbreviations for the months are 'Jan', 'Feb', 'Mar', 'Apr', 'May', 'Jun', 'Jul', 'Aug', 'Sep', 'Oct', 'Nov', and 'Dec'. Note that the real C library ctime function puts a newline (' ') character at the end of the string that this function does not. Also note that since the kernel has no concept of timezones, the returned time is always in GMT. SystemTap Tapset Reference June 2014 FUNCTION::CTIME(3stap)
All times are GMT -4. The time now is 06:43 PM.
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