import: allow the epoch (0s) as a valid time

Despite email not existing until 1971; "Jan 1, 1970 00:00:00"
seems like a common default timestamp for some test emails
to use as a Date: header.

diff --git a/lib/PublicInbox/Import.pm b/lib/PublicInbox/Import.pm
index f8d100377e17e6e3058b2a91e3b0795969b276ea..1f831a7bf118be2649ef21b0936affa01abc2fb9 100644 (file)
--- a/lib/PublicInbox/Import.pm
+++ b/lib/PublicInbox/Import.pm
@@ -233,7 +233,7 @@ sub parse_date ($) {
                warn "bogus TZ offset: $zone, ignoring and assuming +0000\n";
                $zone = '+0000';
        }
-       $ts ||= time;
+       $ts = time unless defined $ts;
        $ts = 0 if $ts < 0; # git uses unsigned times
        "$ts $zone";
 }