How to display hijri date..

Question

hi everyone!
can someone tell how to convert georgian date into hijri date...
and if the date is some old date....
thanks and regards
Tariq.

Answer 1

Here are a few things you might need to know.
1.How to set Calendar to "Arabic Hijrah" ?
2.How to display both Hijrah and Gregorian dates in the same select statement?
3.What is Calendar Deviation?
4.How to set deviation?
Questions & Answers
1.How to set Calendar to "Arabic Hijrah" ?
Answer
Set NLS_CALENDAR parameter in one of the following ways:
1. In the Current session :
SQL> alter session set NLS_CALENDAR="Arabic Hijrah" ;
2. All applications for a specific client:
Set NLS_CALENDAR Variable in client OS environment.
<e.g: On NT: set variable in the registry
On Unix: set UNIX environment variable in .profile/.cshrc>
3. Within SQL function:
SQL> select to_char(sysdate,'day dd month yyyy','nls_calendar=''arabic hijrah''')
from dual ;
References
<Note:30772.1>
2.How to display both Hijrah and Gregorian dates in the same select statement?
Answer
select
to_char(sysdate,'day dd month yyyy','nls_calendar=''arabic hijrah'''),
to_char(sysdate,'day dd month yyyy','nls_calendar=''gregorian''')
from dual ;
References
<bug:1302683>
3.What is Calendar Deviation?
Answer
Since Hijrah month is based on the moon complete revolution around the sun, Hijrah
Calendar has different number of days in a year than Gregorian; therefore some manual
deviation adjustement might be needed for the conversion to/from Gregorian. In other
words HIJRAH calendar is Lunar based, corrections need to be made every so often.
4.How to set deviation?
Answer
1. Shutdown the database
2. Edit lxecal.nlt (lxecal.dat in Oracle7) in $ORACLE_HOME/ocommon/nls.
e.g: to add one day after Sep-29-2000:
DEFINE calendar
calendar_name = "Arabic Hijrah"
DEFINE calendar_deviation
deviation_data = {
<"Sep-29-2000 ad">:1
ENDDEFINE calendar_deviation
ENDDEFINE calendar
Note: Gregorian date specified in the deviation should correspond to one of
29th, 30th or 31th days of the hijrah calendar.
3. Run the NLS Calendar Utility lxegen to register your modification to Oracle calendar
system, this utility generates lxecalah.nlb file in the same directory mentioned above.
4. startup the database.
The same procedure can be followed to subtract days, but number specified in the
deviation_data should be greater than 10.
<e.g: 11 --> subtract one day, 12 --> subtract two days ...etc>
References
Hope this helps
Regards
Grant Ronald
Forms Product Management