Suricata

I'm seeing alerts with timestamp "Thu Jan 1 00:00:00 1970" in both unified2 and fast alert logs.
About 20% of the entries in my logs for the last week are with this timestamp. This is for Suricata from GIT.
Here is a short sample for the logs (with the IP's masked) :

_> 01/01/1970-01:00:00.000000 [**] [1:2803728:3] ETPRO WEB_SERVER OpenSSL ECDH Use After Free Attempt SSL 3.0 [**] [Classification: Attempted User Privilege Gain] [Priority: 1] {TCP} X.X.X.250:49392 -> X.X.X.4:443

09/27/2011-05:54:55.553829 [**] [1:2013295:2] ET POLICY Self Signed SSL Certificate (Snake Oil CA) [**] [Classification: Potential Corporate Privacy Violation] [Priority: 1] {TCP} X.X.X.227:443 -> X.X.X.7:63367
09/27/2011-05:55:08.460580 [**] [1:2803728:3] ETPRO WEB_SERVER OpenSSL ECDH Use After Free Attempt SSL 3.0 [**] [Classification: Attempted User Privilege Gain] [Priority: 1] {TCP} X.X.X.50:1861 -> X.X.X.4:443
09/27/2011-05:56:03.703293 [**] [1:2010904:5] ET USER_AGENTS Fake Mozilla UA Inbound (Mozilla/0.xx) [**] [Classification: Potentially Bad Traffic] [Priority: 2] {TCP} X.X.X.178:53551 -> X.X.X.4:80
01/01/1970-01:00:00.000000 [**] [1:2803728:3] ETPRO WEB_SERVER OpenSSL ECDH Use After Free Attempt SSL 3.0 [**] [Classification: Attempted User Privilege Gain] [Priority: 1] {TCP} X.X.X.50:1924 -> X.X.X.4:443
09/27/2011-06:00:05.844775 [**] [1:2010904:5] ET USER_AGENTS Fake Mozilla UA Inbound (Mozilla/0.xx) [**] [Classification: Potentially Bad Traffic] [Priority: 2] {TCP} X.X.X.196:61530 -> X.X.X.4:80
09/27/2011-06:00:55.776206 [**] [1:2803728:3] ETPRO WEB_SERVER OpenSSL ECDH Use After Free Attempt SSL 3.0 [**] [Classification: Attempted User Privilege Gain] [Priority: 1] {TCP} X.X.X.62:64883 -> X.X.X.4:443
09/27/2011-06:08:34.935037 [**] [1:2803728:3] ETPRO WEB_SERVER OpenSSL ECDH Use After Free Attempt SSL 3.0 [**] [Classification: Attempted User Privilege Gain] [Priority: 1] {TCP} X.X.X.243:56971 -> X.X.X.4:443
09/27/2011-06:09:15.765385 [**] [1:2002945:10] ET POLICY Java Url Lib User Agent Web Crawl [**] [Classification: Attempted Information Leak] [Priority: 2] {TCP} X.X.X.10:2913 -> X.X.X.4:80
01/01/1970-01:00:00.000000 [**] [1:2803728:3] ETPRO WEB_SERVER OpenSSL ECDH Use After Free Attempt SSL 3.0 [**] [Classification: Attempted User Privilege Gain] [Priority: 1] {TCP} X.X.X.212:47548 -> X.X.X.4:443
01/01/1970-01:00:00.000000 [**] [1:2803728:3] ETPRO WEB_SERVER OpenSSL ECDH Use After Free Attempt SSL 3.0 [**] [Classification: Attempted User Privilege Gain] [Priority: 1] {TCP} X.X.X.243:57413 -> X.X.X.4:443
01/01/1970-01:00:00.000000 [**] [1:2803728:3] ETPRO WEB_SERVER OpenSSL ECDH Use After Free Attempt SSL 3.0 [**] [Classification: Attempted User Privilege Gain] [Priority: 1] {TCP} X.X.X.111:1089 -> X.X.X.4:443
01/01/1970-01:00:00.000000 [**] [1:2803728:3] ETPRO WEB_SERVER OpenSSL ECDH Use After Free Attempt SSL 3.0 [**] [Classification: Attempted User Privilege Gain] [Priority: 1] {TCP} X.X.X.243:57826 -> X.X.X.4:443
01/01/1970-01:00:00.000000 [**] [1:2803728:3] ETPRO WEB_SERVER OpenSSL ECDH Use After Free Attempt SSL 3.0 [**] [Classification: Attempted User Privilege Gain] [Priority: 1] {TCP} X.X.X.212:32967 -> X.X.X.4:443
09/27/2011-06:39:46.487946 [**] [1:2803728:3] ETPRO WEB_SERVER OpenSSL ECDH Use After Free Attempt SSL 3.0 [**] [Classification: Attempted User Privilege Gain] [Priority: 1] {TCP} X.X.X.79:2085 -> X.X.X.4:443
09/27/2011-06:41:13.796010 [**] [1:2803728:3] ETPRO WEB_SERVER OpenSSL ECDH Use After Free Attempt SSL 3.0 [**] [Classification: Attempted User Privilege Gain] [Priority: 1] {TCP} X.X.X.176:1406 -> X.X.X.4:443
01/01/1970-01:00:00.000000 [**] [1:2803728:3] ETPRO WEB_SERVER OpenSSL ECDH Use After Free Attempt SSL 3.0 [**] [Classification: Attempted User Privilege Gain] [Priority: 1] {TCP} X.X.X.20:38124 -> X.X.X.4:443_