1 # Copyright (C) 2018 all contributors <meta@public-inbox.org>
2 # License: AGPL-3.0+ <https://www.gnu.org/licenses/agpl-3.0.txt>
4 # Various date/time-related functions
5 package PublicInbox::MsgTime;
9 our @EXPORT_OK = qw(msg_timestamp msg_datestamp);
10 use Date::Parse qw(str2time strptime);
12 sub str2date_zone ($) {
15 my $ts = str2time($date);
16 return undef unless(defined $ts);
18 # off is the time zone offset in seconds from GMT
19 my ($ss,$mm,$hh,$day,$month,$year,$off) = strptime($date);
20 return undef unless(defined $off);
22 # Compute the time zone from offset
23 my $sign = ($off < 0) ? '-' : '+';
24 my $hour = abs(int($off / 3600));
25 my $min = ($off / 60) % 60;
26 my $zone = sprintf('%s%02d%02d', $sign, $hour, $min);
28 # "-1200" is the furthest westermost zone offset,
29 # but git fast-import is liberal so we use "-1400"
30 if ($zone >= 1400 || $zone <= -1400) {
31 warn "bogus TZ offset: $zone, ignoring and assuming +0000\n";
37 sub time_response ($) {
39 wantarray ? @$ret : $ret->[0];
42 sub msg_received_at ($) {
43 my ($hdr) = @_; # Email::MIME::Header
44 my @recvd = $hdr->header_raw('Received');
46 foreach my $r (@recvd) {
47 $r =~ /\s*([0-9]+\s+[a-zA-Z]+\s+[0-9]{2,4}\s+
48 [0-9]+[^0-9][0-9]+(?:[^0-9][0-9]+)
49 \s+([\+\-][0-9]+))/sx or next;
50 $ts = eval { str2date_zone($1) } and return $ts;
51 my $mid = $hdr->header_raw('Message-ID');
52 warn "no date in $mid Received: $r\n";
57 sub msg_date_only ($) {
58 my ($hdr) = @_; # Email::MIME::Header
59 my @date = $hdr->header_raw('Date');
61 foreach my $d (@date) {
62 # Y2K problems: 3-digit years
63 $d =~ s!([A-Za-z]{3}) ([0-9]{3}) ([0-9]{2}:[0-9]{2}:[0-9]{2})!
64 my $yyyy = $2 + 1900; "$1 $yyyy $3"!e;
65 $ts = eval { str2date_zone($d) } and return $ts;
67 my $mid = $hdr->header_raw('Message-ID');
68 warn "bad Date: $d in $mid: $@\n";
74 # Favors Received header for sorting globally
75 sub msg_timestamp ($) {
76 my ($hdr) = @_; # Email::MIME::Header
78 $ret = msg_received_at($hdr) and return time_response($ret);
79 $ret = msg_date_only($hdr) and return time_response($ret);
80 wantarray ? (time, '+0000') : time;
83 # Favors the Date: header for display and sorting within a thread
84 sub msg_datestamp ($) {
85 my ($hdr) = @_; # Email::MIME::Header
87 $ret = msg_date_only($hdr) and return time_response($ret);
88 $ret = msg_received_at($hdr) and return time_response($ret);
89 wantarray ? (time, '+0000') : time;