how should i delete lines older then 5 minute from a file which has lines as below
2013-12-22 22:40:44.413 37.123.97.70 95.88.68.72 14109 49304 385 0x18 6 256
2013-12-22 22:40:44.414 37.123.99.218 88.252.179.218 31701 4621 68 0x10 6 256
2013-12-22 22:40:44.414 178.20.231.102 78.183.53.41 80 53905 1514 0x10 6 256
2013-12-22 22:40:44.415 185.9.159.17 139.27.241.27 4980 445 70 0x02 6 256
2013-12-22 22:40:44.415 178.20.225.205 173.245.53.168 80 58023 82 0x12 6 256
2013-12-22 22:40:44.415 178.20.230.21 78.166.207.202 7777 55093 103 0x12 17 256
2013-12-22 22:40:44.416 178.20.231.102 94.123.206.219 80 15558 1462 0x10 6 256
2013-12-22 22:40:44.560 178.20.231.102 78.183.53.41 80 53916 1514 0x10 6 256
2013-12-22 22:40:44.561 185.9.159.61 50.23.124.46 2794 3389 68 0x14 6 256
2013-12-22 22:40:44.561 178.20.230.190 60.173.11.197 80 52219 1522 0x10 6 256
2013-12-22 22:40:44.562 185.9.159.61 50.23.172.118 2779 3389 68 0x04 6 256
2013-12-22 22:40:44.562 185.9.156.136 88.170.121.30 7102 57235 1428 0x18 6 256
2013-12-22 22:40:44.562 178.20.230.198 88.244.251.111 27015 27005 125 0x18 17 256
2013-12-22 22:40:44.562 178.20.227.86 173.194.70.116 3396 443 91 0x18 6 256
2013-12-22 22:40:44.683 178.20.228.120 94.121.72.60 28281 56120 122 0x18 6 256
2013-12-22 22:40:44.684 178.20.230.198 95.15.92.219 27015 27005 147 0x18 17 256
2013-12-22 22:40:44.684 178.20.225.204 141.101.98.94 80 15427 74 0x10 6 256
2013-12-22 22:40:44.684 178.20.230.21 88.246.211.15 7777 15911 330 0x10 17 256
2013-12-22 22:40:44.685 185.9.159.61 50.23.150.170 4022 3389 349 0x18 6 256
2013-12-22 22:40:44.705 178.20.227.71 71.122.225.92 4022 3389 1522 0x18 17 256
2013-12-22 22:40:44.705 185.9.159.218 193.140.225.132 80 31266 1522 0x10 6 256
2013-12-22 22:40:44.754 178.20.231.4 78.177.107.74 80 22942 1462 0x10 6 256
2013-12-22 22:40:44.755 185.9.159.160 164.29.48.61 3708 445 70 0x02 6 256
2013-12-22 22:40:44.755 37.123.100.41 188.3.4.237 13200 1830 182 0x18 6 256
2013-12-22 22:40:44.756 185.9.156.136 88.231.184.107 9999 1296 68 0x10 6 256
2013-12-22 22:40:44.756 185.9.159.158 78.177.74.180 27015 27005 89 0x10 17 256
2013-12-22 22:40:44.756 185.9.159.61 50.23.196.186 3044 3389 68 0x10 6 256
2013-12-22 22:40:44.756 185.9.159.70 62.165.213.180 10334 33982 76 0x10 17 256
2013-12-22 22:40:44.757 178.20.231.92 195.175.39.91 53 43945 96 0x10 17 256
2013-12-22 22:40:44.861 37.123.99.213 62.210.129.52 2576 80 68 0x10 6 256
2013-12-22 22:40:44.861 37.123.99.196 88.232.195.163 31691 55976 110 0x18 6 256
2013-12-22 22:40:44.862 185.9.159.61 50.23.38.98 4675 3389 93 0x18 6 256
2013-12-22 22:40:44.863 178.20.227.71 199.223.219.71 4675 3389 1522 0x18 17 256
2013-12-22 22:40:44.863 185.9.159.61 50.23.184.102 3363 3389 68 0x10 6 256
2013-12-22 22:40:44.864 185.9.159.61 50.23.33.215 3842 3389 68 0x10 6 256
2013-12-22 22:40:44.864 178.20.230.180 78.179.132.228 9998 49465 1514 0x10 6 256
2013-12-22 22:40:44.865 178.20.226.121 176.227.204.58 52919 80 74 0x10 6 256
2013-12-22 22:40:45.053 185.9.159.61 50.23.113.165 3927 3389 115 0x18 6 256
2013-12-22 22:40:45.053 178.20.231.82 78.168.36.236 80 63232 1474 0x10 6 256
2013-12-22 22:40:45.053 178.20.231.95 217.79.181.38 80 56874 1522 0x10 6 256
2013-12-22 22:40:45.054 185.9.159.61 50.20.217.230 1192 3389 449 0x18 6 256
2013-12-22 22:40:45.054 185.9.159.61 50.23.196.26 4276 3389 68 0x10 6 256
2013-12-22 22:40:45.055 178.20.225.197 141.101.92.234 80 50112 1522 0x10 6 256
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