How to use Date Time Variable in Dynamic Query

In some scenario you might have come across to fetch record with in some date time range.
Here I am sharing some code for this. Suppose I am querying records from Minutes Object. There is two field Start_Time and End_Time present in Minutes Object.
This is my page

<apex:inputField value="{!minute.Start_Time__c}" required="true" label="From Date"/>
<apex:inputField value="{!minuteObj.End_Time__c}" required="true" label="To Date"/>
<apex:commandButton action="{!convertValidMinutesToUsage}" value="Process Minute's"/>

This is my controller
public with sharing class ControllerValidMinutesToUsage {
public Minute__c minute{get;set;}
DateTime startDate;
DateTime endDate;
string query;

public ControllerValidMinutesToUsage(){
minute = new Minute__c();
}

public void convertValidMinutesToUsage(){
String sStartdate;
String sEndDate;
startDate = minute.Start_Time__c;
sStartdate = startDate.format('yyyy-MM-dd\'T\'HH:mm:ss\'Z\'');
endDate = minuteObj.End_Time__c+1;
sEndDate = endDate.format('yyyy-MM-dd\'T\'HH:mm:ss\'Z\'');
query = 'SELECT Start_Time__c ,End_Time__c, Is_Valid__c WHERE Is_Valid__c = false';
query += ' AND Start_Time__c >='+sStartdate+' '+'AND Start_Time__c <='+sEndDate
list<Minute__c> = DateBase.query(query );
}
}

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