Philippe 13/07/2022: date_time: correct problem with use of default constructor

src/MNH/prep_ideal_case.f90

-!MNH_LIC Copyright 1994-2021 CNRS, Meteo-France and Universite Paul Sabatier
+!MNH_LIC Copyright 1994-2022 CNRS, Meteo-France and Universite Paul Sabatier
 !MNH_LIC This is part of the Meso-NH software governed by the CeCILL-C licence
 !MNH_LIC version 1. See LICENSE, CeCILL-C_V1-en.txt and CeCILL-C_V1-fr.txt
 !MNH_LIC for details. version 1.
@@ -1480,7 +1480,7 @@ IF (CIDEAL == 'RSOU') THEN
   WRITE(NLUOUT,FMT=*) 'CIDEAL="RSOU", attempt to read DATE'
   CALL POSKEY(NLUPRE,NLUOUT,'RSOU')
   READ(NLUPRE,FMT=*)  NYEAR,NMONTH,NDAY,XTIME
-  TDTCUR = DATE_TIME(DATE(NYEAR,NMONTH,NDAY),XTIME)
+  TDTCUR = DATE_TIME(NYEAR,NMONTH,NDAY,XTIME)
   TDTEXP = TDTCUR
   TDTSEG = TDTCUR
   TDTMOD = TDTCUR
@@ -1499,7 +1499,7 @@ ELSE IF (CIDEAL == 'CSTN') THEN
   WRITE(NLUOUT,FMT=*) 'CIDEAL="CSTN", attempt to read DATE'
   CALL POSKEY(NLUPRE,NLUOUT,'CSTN')
   READ(NLUPRE,FMT=*)  NYEAR,NMONTH,NDAY,XTIME
-  TDTCUR = DATE_TIME(DATE(NYEAR,NMONTH,NDAY),XTIME)
+  TDTCUR = DATE_TIME(NYEAR,NMONTH,NDAY,XTIME)
   TDTEXP = TDTCUR
   TDTSEG = TDTCUR
   TDTMOD = TDTCUR