Question

I need to compare between userCurrentDate to a list of options.

The options is a table in the database that contain time attribute (definition: TIMESTAMP(6) WITH TIME ZONE. in oracle). Each option have his time zone.

The userCurrentDate (definition Date. in java) is a parameter that hold the user time and date with offset. The user can be from all over the world, so each user is in different time zone.

I need to compare between the user current date to the options date.
So i need to get this 2 parameters in the same time zone.

How can i get this 2 parameters in the same time zone, in SQL?

I tried to get them in GMT, so i can get them in the same base, like this:

trunc(SYS_EXTRACT_UTC(o.time)) = trunc(sysdate)  

But its not a good solution.

So, i need to get them in the same timezone. how can i get that in an SQL command (or other solution)?

Answer 1

I resolve this problem with at time zone oracle function.
used:

to_timestamp_tz(to_char(CAST(FROM_TZ(CAST(sysdate AS TIMESTAMP), 'GMT') AT TIME ZONE o.time AS DATE) 

and compare it to each other.