how to grep and compare timestamp in a file with the current date

UNIX AIX
1

I want to read a log file from a particular location.In the logfile , lines contains timestamp.I need to compare the timestamp in the logfile with the current date.If the timpestamp in the log file is less than 4 hours then i need to read the file from that location.Below is the file format.Please help as its urgent.
[4/30/09 4:03:51:100 EST] 00000070 AdminServiceI W ADMN0037W:
[4/30/09 4:04:12:064 EST] 00000721 InvalidateByI E DYNA0052E:
[4/30/09 4:04:47:335 EST] 000000e1 LeaseAlarm I SCHD0134I:
[4/30/09 4:05:21:015 EST] 00000070 AdminServiceI W ADMN0037W:
[4/30/09 4:06:51:079 EST] 00000070 AdminServiceI W ADMN0037W:

2

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