Timestamp

Is a data type that stores a date and time in utc.

The default session time zore is utc, which meeans that by default timestamp with ti me zone values display in utf.

UTC(Universal Time Coordinated)

The zone details(timestamp with time zone):

-converts timestamp values from utc to the clients’s session timezone.

However,it is important for note that timestamp with time zone does not store any time zone data.

Time without time zone.

presents all timestamp values in utc.