Although the global dates are different the icbc is generating error related to opening some other file. That file too is present in the directory but still there is error.
 
[pmdtest@pmd HIST]$ ../bin/icbc regcm.in

  This is icbc part of the RegCM version 4
   SVN Revision:  compiled at: data : Jul 22 2014  time: 09:14:57

 : this run start at    : 2014-07-22 11:36:01+0500
 : it is submitted by   : pmdtest
 : it is running on     : pmd.pakmet.com
 : in directory         : /home/pmdtest/RegCM-4.4-rc31/HIST
                      
 GLOBIDATE1 : 1970-01-01 00:00:00 UTC        
 GLOBIDATE2 : 2006-01-01 00:00:00 UTC        
 NSTEPS     :        52561
 No such file or directory                                                      
 mod_gn6hnc.F90 :      242:Error open ./DATA/GFDL-ESM2M/RF/ta/ta_6hrLev_GFDL-ESM2M_historical_r1i1p1_1951010100-1955123123.nc:            2


--
Ahsan