Hallo dear Perl Monks!

I wish you a happy new Year 2015! Hoping you will share your wisdom as you did last year.

I have a huge file of SMS Messages (Macintosh) where I need to transform the timestamps into human readable dates. I did not captured well, how to calculate the daylight savings ...

While copying and pasting many many SMS into my file to make a perl script working on it, I am very proud of my poor programming skills, until there is a message popping up claiming to be sent at 12:12 - but the calculated time is 11:12 :-(

Here my example script. Thank you for your insight!

marek 

#! /usr/bin/perl

# I am trying to convert the seconds of the sms database into a
# reasonable date. 
# But there is a problem left: the daylight saving time (Sommerzeit vs
+ Winterzeit)

use warnings;
use strict;

use Date::Calc qw(Localtime Day_of_Week Day_of_Week_to_Text);

my %date_pairs = (
    391263207 => "Sonntag, 26.05.2013 - 13:13:27", 
    410000659 => "Sonntag, 29.12.2013 - 10:04:19",
    410891318 => "Mittwoch, 08.01.2014 - 17:28:38",
    412528640 => "Montag, 27.01.2014 - 16:17:20",
    413028709 => "Sonntag, 02.02.2014 - 11:11:49",
    414241970 => "Sonntag, 16.02.2014 - 12:12:50",
    433494560 => "Samstag, 27.09.2014 - 09:09:20"
);


foreach my $key ( keys %date_pairs ) {
    print "="x130;
    my $timestamp = $key;
    my ($year,$month,$day, $hour,$min,$sec, $doy,$dow,$dst) =
          Localtime($timestamp);
    print "\nOriginal Vars:\nTimestamp is: $timestamp\nYear: $year, Mo
+nth: $month, Day: $day, Hour: $hour, Minutes: $min, Seconds: $sec, Da
+y of Year: $doy, Day of Week: $dow, Daylight saving: $dst \n","_"x130
+,"\n";

    $year += 31;
    $dow = Day_of_Week($year,$month,$day);
    my $lang = 3; # this is for German language

    my $dow_name = Day_of_Week_to_Text($dow,$lang);

    my $calculated_date = sprintf "%s, %02s.%02s.%d - %02s:%02s:%02s",
+ $dow_name, $day, $month, $year, $hour, $min, $sec;

    print "Transformed Vars:\nYear: $year, Month: $month, Day: $day, H
+our: $hour, Minutes: $min, Seconds: $sec, Day of Year: $doy, Day of W
+eek: $dow, Daylight saving: $dst \nCalculated Date:\t$calculated_date
+\nExpected Date:\t\t$date_pairs{$key}\n";
    
}

print "="x130;

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In reply to Date::Calc and and daylight savings time by marek1703

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