1 # Copyright (C) 2018 all contributors <meta@public-inbox.org>
2 # License: AGPL-3.0+ <https://www.gnu.org/licenses/agpl-3.0.txt>
3 package PublicInbox::MsgTime;
7 our @EXPORT_OK = qw(msg_timestamp msg_datestamp);
8 use Date::Parse qw(str2time strptime);
10 sub str2date_zone ($) {
13 my $ts = str2time($date);
14 return undef unless(defined $ts);
16 # off is the time zone offset in seconds from GMT
17 my ($ss,$mm,$hh,$day,$month,$year,$off) = strptime($date);
18 return undef unless(defined $off);
20 # Compute the time zone from offset
21 my $sign = ($off < 0) ? '-' : '+';
22 my $hour = abs(int($off / 3600));
23 my $min = ($off / 60) % 60;
24 my $zone = sprintf('%s%02d%02d', $sign, $hour, $min);
26 # "-1200" is the furthest westermost zone offset,
27 # but git fast-import is liberal so we use "-1400"
28 if ($zone >= 1400 || $zone <= -1400) {
29 warn "bogus TZ offset: $zone, ignoring and assuming +0000\n";
35 sub time_response ($) {
37 wantarray ? @$ret : $ret->[0];
40 sub msg_received_at ($) {
41 my ($hdr) = @_; # Email::MIME::Header
42 my @recvd = $hdr->header_raw('Received');
44 foreach my $r (@recvd) {
45 $r =~ /\s*(\d+\s+[[:alpha:]]+\s+\d{2,4}\s+
46 \d+\D\d+(?:\D\d+)\s+([\+\-]\d+))/sx or next;
47 $ts = eval { str2date_zone($1) } and return $ts;
48 my $mid = $hdr->header_raw('Message-ID');
49 warn "no date in $mid Received: $r\n";
54 sub msg_date_only ($) {
55 my ($hdr) = @_; # Email::MIME::Header
56 my @date = $hdr->header_raw('Date');
58 foreach my $d (@date) {
59 # Y2K problems: 3-digit years
60 $d =~ s!([A-Za-z]{3}) (\d{3}) (\d\d:\d\d:\d\d)!
61 my $yyyy = $2 + 1900; "$1 $yyyy $3"!e;
62 $ts = eval { str2date_zone($d) } and return $ts;
64 my $mid = $hdr->header_raw('Message-ID');
65 warn "bad Date: $d in $mid: $@\n";
71 # Favors Received header for sorting globally
72 sub msg_timestamp ($) {
73 my ($hdr) = @_; # Email::MIME::Header
75 $ret = msg_received_at($hdr) and return time_response($ret);
76 $ret = msg_date_only($hdr) and return time_response($ret);
77 wantarray ? (time, '+0000') : time;
80 # Favors the Date: header for display and sorting within a thread
81 sub msg_datestamp ($) {
82 my ($hdr) = @_; # Email::MIME::Header
84 $ret = msg_date_only($hdr) and return time_response($ret);
85 $ret = msg_received_at($hdr) and return time_response($ret);
86 wantarray ? (time, '+0000') : time;