Check if current date is between two dates Oracle SQL

You don't need to apply to_date() to sysdate. It is already there:

select 1from dual WHERE sysdate BETWEEN TO_DATE('28/02/2014', 'DD/MM/YYYY') AND TO_DATE('20/06/2014', 'DD/MM/YYYY');

If you are concerned about the time component on the date, then use trunc():

select 1from dual WHERE trunc(sysdate) BETWEEN TO_DATE('28/02/2014', 'DD/MM/YYYY') AND                             TO_DATE('20/06/2014', 'DD/MM/YYYY');

SELECT to_char(emp_login_date,'DD-MON-YYYY HH24:MI:SS'),A.* FROM emp_log AWHERE emp_login_date BETWEEN to_date(to_char('21-MAY-2015 11:50:14'),'DD-MON-YYYY HH24:MI:SS')ANDto_date(to_char('22-MAY-2015 17:56:52'),'DD-MON-YYYY HH24:MI:SS') ORDER BY emp_login_date

TSQL: Dates- need to look for gaps in dates between Two Date

selectdistincte1.enddate,e3.startdate,DATEDIFF(DAY,e1.enddate,e3.startdate)-1 as [Datediff]from #temp e1    join #temp e3 on e1.enddate < e3.startdate                 /* Finds the next start Time */and e3.startdate = (select min(startdate) from #temp e5where e5.startdate > e1.enddate)and not exists (select *  /* Eliminates e1 rows if it is overlapped */from #temp e5 where e5.startdate < e1.enddate and e5.enddate > e1.enddate);