Unix - Invalid character in date/time specification

Question

I am trying to find last day of the month. Date in DDMMYYYY format.

#!/bin/bash

start_date=01092018

end_date=$(date +%m%Y -d "$start_date +1 month")
echo $end_date

Expected Result :30092018

But it gives below error : Invalid character in date/time specification. Usage :date [-u] [+Field Descriptors]

Aix!date doesn't know GNU extensions. You could use Perl for such calculations. Example: https://github.com/lzsiga/pldate `perl pldate set 20180901 add-month 1 printf %m%Y` — Lorinczy Zsigmond, Dec 23 '19 at 13:42

score 0 · Answer 1 · answered Dec 24 '19 at 12:29

AIX date do not support -d. So you can't use constructions like date -d. For reference you can check AIX date man page

Nut you can try something in perl:

perl -MPOSIX -le '@x=localtime; if($x[4]!=0) {$x[4]++} else {$x[4]=11;$x[5]++};print strftime ("%Y-%m-%d", @x)'

1 Answers1