[kronolith] Blank page after loading calender

[A Kong]

Hi,

Happy  New Year!
I installed kronolith with horde and imp. I have included kronolith as
calender within imp. But it was blank page when I click on the clender
icon. Wonder kronolith can go with imp together. Pls advise on getting
kornolith working.

Packages version:
php-4.3.3
horde-2.2.4
imp-3.2.2
kronolith-1.1
turba-1.2.1
mysql-standard-4.0.15-sun-solaris2.8-sparc

Platform running:
Sun Sparc Solaris 2.8

The following messages were obervered in error.log from apache:

[Fri Jan  2 16:03:20 2004] [error] PHP Fatal error:  main(): Failed
opening requ
ired 'Date/Calc.php'
(include_path='.:/usr/local/php/include:/usr/local/php/lib/
php') in /local/WWW/horde/kronolith/lib/base.php on line 63
[Fri Jan  2 16:04:32 2004] [error] [client 137.189.33.6] File does not
exist: /l
ocal/WWW/horde/imp/kronolith
[Fri Jan  2 16:36:10 2004] [error] PHP Warning:  main(Date/Calc.php):
failed to
open stream: No such file or directory in
/local/WWW/horde/kronolith/lib/base.ph
p on line 63
[Fri Jan  2 16:36:10 2004] [error] PHP Fatal error:  main(): Failed
opening requ
ired 'Date/Calc.php'
(include_path='.:/usr/local/php/include:/usr/local/php/lib/
php') in /local/WWW/horde/kronolith/lib/base.php on line 63

Do I need to install calender package with php and which 
package(calender or date)?

Thank you very much for your help.

Regards
Alan