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Full Discussion: Cut string from shell
Top Forums Shell Programming and Scripting Cut string from shell Post 303027580 by wisecracker on Wednesday 19th of December 2018 11:35:09 AM
Old 12-19-2018
Longhand using OSX 10.14.1, default bash terminal calling dash, POSIX compliant.
This assumes that the format is consistent as per the OP.
Code:
Last login: Wed Dec 19 16:12:52 on ttys000
AMIGA:amiga~> dash
AMIGA:\u\w> # POSIX compliant using dash, OSX 10.14.1, default bash terminal.
AMIGA:\u\w> STRING="20181219"
AMIGA:\u\w> year="${STRING%????}"
AMIGA:\u\w> date="${STRING#??????}"
AMIGA:\u\w> STRING="${STRING#????}"
AMIGA:\u\w> month="${STRING%??}"
AMIGA:\u\w> echo $year $month $date
2018 12 19
AMIGA:\u\w> exit
AMIGA:amiga~> _

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CAL_FROM_JD(3)								 1							    CAL_FROM_JD(3)

cal_from_jd - Converts from Julian Day Count to a supported calendar

SYNOPSIS
array cal_from_jd (int $jd, int $calendar) DESCRIPTION
cal_from_jd(3) converts the Julian day given in $jd into a date of the specified $calendar. Supported $calendar values are CAL_GREGORIAN, CAL_JULIAN, CAL_JEWISH and CAL_FRENCH. PARAMETERS
o $jd - Julian day as integer o $calendar - Calendar to convert to RETURN VALUES
Returns an array containing calendar information like month, day, year, day of week, abbreviated and full names of weekday and month and the date in string form "month/day/year". EXAMPLES
Example #1 cal_from_jd(3) example <?php $today = unixtojd(mktime(0, 0, 0, 8, 16, 2003)); print_r(cal_from_jd($today, CAL_GREGORIAN)); ?> The above example will output: Array ( [date] => 8/16/2003 [month] => 8 [day] => 16 [year] => 2003 [dow] => 6 [abbrevdayname] => Sat [dayname] => Saturday [abbrevmonth] => Aug [monthname] => August ) SEE ALSO
cal_to_jd(3), jdtofrench(3), jdtogregorian(3), jdtojewish(3), jdtojulian(3), jdtounix(3). PHP Documentation Group CAL_FROM_JD(3)
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