Extract logs between time frame with non specific time stamp using bash - bash

Question

I want to fetch log between two time stamps but i do not have specific time stamps with me. I can use the command sed for fetching if I have specific time stamp in log using the following command
sed -rne '/$StartTime/,/$EndTime/'p <filename>
My query is that since the specific StartTime and EndTime which I'm fetching from my DB might not be present in the log file, I will have to fetch the log between times near to the StartTime and EndTime that I provide using >= and <= signs. I tried the following command but it does not work.
awk '$0>=st && $0<=et' st=$StartTime et=$EndTime <filename>
Sample input and output
Input
Time retrieved from DB
StartTime - 2017-11-02 10:20:00
EndTime - 2017-11-02 11:20:00
The time present in log
T1 - 2017-11-02 10:17:44
T2 - 2017-11-02 11:19:32
Output: Entire Log text between T1 & T2
Sample Log
2017-03-03 10:43:18,736 [main] WARN - ORACLE_HOSTNAME=xxxxxxxxxx[OVERRIDES:
xxxxxxxxxxxxxxxx]
2017-03-03 10:43:18,736 [main] WARN - NLS_DATE_FORMAT=DD-MON-YYYY
HH24:MI:SS [OVERRIDES: DD-MON-YYYY HH24:MI:SS]
2017-03-03 10:43:18,736 [main] WARN - xxxxUsername=MDMPIUSER [OVERRIDES: MDMPIUSER]
2017-03-03 10:43:18,736 [main] WARN - BUNDLE_GEMFILE=uri:classloader://installer/Gemfile [OVERRIDES: uri:classloader://installer/Gemfile]
2017-03-03 10:43:18,736 [main] WARN - TIMEOUT=900 [OVERRIDES: 900]
2017-03-03 10:43:18,736 [main] WARN - SHLVL=4 [OVERRIDES: 4]
2017-03-03 10:43:18,736 [main] WARN - HISTSIZE=1000 [OVERRIDES: 1000]
2017-03-03 10:43:18,736 [main] WARN - JAVA_HOME=/usr/java/jdk1.8.0_60/jre [OVERRIDES: /usr/java/jdk1.8.0_60/jre]
2017-03-03 10:43:20,156 [main] WARN - APP_PROPS=/home/xxx/conf/appProperties [OVERRIDES: /home/xxx/conf/appProperties]

Answer 1

You can try
awk -v start="$StartTime" -v end="$EndTime" '
function fonct(date)
{
gsub(/-|,| |:/,"",date)
return date
}
BEGIN{
start=fonct(start)
end=fonct(end)
}
{
a=fonct($1$2)
if (a>=start && a<=end)print $0
}' infile