diff --git a/lib/imc_block.hpp b/lib/imc_block.hpp
index 5a1cfca..332a3b6 100644
--- a/lib/imc_block.hpp
+++ b/lib/imc_block.hpp
@@ -63,7 +63,7 @@ namespace imc
         std::cout<<"WARNING: invalid length parameter in "<<thekey_.name_<<"-block "
                  <<"(block-end:"<<end_<<",buffer-size:"<<buffer_->size()<<")"
                  <<" => resetting block-end to buffer-size\n";
-        end_ = buffer_->size();
+        end_ = (unsigned long int)(buffer_->size());
       }
 
       try {
diff --git a/lib/imc_channel.hpp b/lib/imc_channel.hpp
index ddcbd3d..db5c29c 100644
--- a/lib/imc_channel.hpp
+++ b/lib/imc_channel.hpp
@@ -215,7 +215,7 @@ namespace imc
         // xname_ = std::string("time");
 
         // find appropriate precision for "xdata_" by means of "xstepwidth_"
-        xprec_ = (xstepwidth_ > 0 ) ? ceil(fabs(log10(xstepwidth_))) : 10;
+        xprec_ = (xstepwidth_ > 0 ) ? (int)ceil(fabs(log10(xstepwidth_))) : 10;
       }
 
       // extract associated CP data
@@ -296,7 +296,7 @@ namespace imc
                                            buffer_->begin()+buffstrt+buffer_size_+1 );
 
       // determine number of values in buffer
-      unsigned long int num_values = CSbuffer.size()/(signbits_/8);
+      unsigned long int num_values = (unsigned long int)(CSbuffer.size()/(signbits_/8));
       if ( num_values*(signbits_/8) != CSbuffer.size() )
       {
         throw std::runtime_error("CSbuffer and significant bits of datatype don't match");
diff --git a/lib/imc_datatype.hpp b/lib/imc_datatype.hpp
index 58ce727..5bceb00 100644
--- a/lib/imc_datatype.hpp
+++ b/lib/imc_datatype.hpp
@@ -48,7 +48,7 @@ namespace imc
   public:
     datatype(): ubyte_(0), sbyte_(0),
                 ushort_(0), sshort_(0),
-                ulint_(0.0), slint_(0.0),
+                ulint_(0), slint_(0),
                 sfloat_(0.0), sdouble_(0.0),
                 sdigital_(0),
                 dtidx_(0) { };
@@ -61,10 +61,10 @@ namespace imc
     datatype(imc_Slongint num): slint_(num), dtidx_(5) {};
     datatype(imc_float num): sfloat_(num), dtidx_(6) {};
     datatype(imc_double num): ubyte_(0), sbyte_(0), ushort_(0), sshort_(0),
-                              ulint_(0.0), slint_(0.0), sfloat_(0.0), sdouble_(num),
+                              ulint_(0), slint_(0), sfloat_(0.0), sdouble_(num),
                               sdigital_(0), dtidx_(7) {};
     datatype(imc_digital num): ubyte_(0), sbyte_(0), ushort_(0), sshort_(0),
-                               ulint_(0.0), slint_(0.0), sfloat_(0.0), sdouble_(num),
+                               ulint_(0), slint_(0), sfloat_(0.0), sdouble_(num),
                                sdigital_(num), dtidx_(10) {};
 
     // identify type
diff --git a/lib/imc_object.hpp b/lib/imc_object.hpp
index 7747ec2..cbf6415 100644
--- a/lib/imc_object.hpp
+++ b/lib/imc_object.hpp
@@ -500,22 +500,22 @@ namespace imc
       minute_ = std::stoi( get_parameter(buffer,&parameters[6]) );
       second_ = std::stod( get_parameter(buffer,&parameters[7]) );
 
-      time_t rawtime;
-      struct tm ts;
-      time(&rawtime);
-      localtime_r(&rawtime,&ts);
-      ts.tm_mday = day_;
-      ts.tm_mon = month_-1;
-      ts.tm_year = year_-1900;
-      ts.tm_hour = hour_;
-      ts.tm_min = minute_;
-      ts.tm_sec = (int)second_;
-      asctime_r(&ts,&timestamp_[0]);
-      // timestamp_ = std::to_string(year_) + std::string("-") + std::to_string(month_)
-      //                                    + std::string("-") + std::to_string(day_)
-      //                                    + std::string("T") + std::to_string(hour_)
-      //                                    + std::string(":") + std::to_string(minute_)
-      //                                    + std::string(":") + std::to_string(second_);
+      //time_t rawtime;
+      //struct tm ts;
+      //time(&rawtime);
+      //localtime_r(&rawtime,&ts);
+      //ts.tm_mday = day_;
+      //ts.tm_mon = month_-1;
+      //ts.tm_year = year_-1900;
+      //ts.tm_hour = hour_;
+      //ts.tm_min = minute_;
+      //ts.tm_sec = (int)second_;
+      //asctime_r(&ts,&timestamp_[0]);
+      timestamp_ = std::to_string(year_) + std::string("-") + std::to_string(month_)
+                                         + std::string("-") + std::to_string(day_)
+                                         + std::string("T") + std::to_string(hour_)
+                                         + std::string(":") + std::to_string(minute_)
+                                         + std::string(":") + std::to_string(second_);
     }
 
     // get info string
diff --git a/lib/imc_raw.hpp b/lib/imc_raw.hpp
index dee65c4..6632fe0 100644
--- a/lib/imc_raw.hpp
+++ b/lib/imc_raw.hpp
@@ -123,20 +123,20 @@ namespace imc
                   leng.push_back((char)*(it+pos));
                   pos++;
                 }
-                unsigned long length = std::stoul(leng);
+                unsigned long int length = std::stoul(leng);
 
                 // declare and initialize corresponding key and block
                 // imc::key bkey( *(it+1)==imc::key_crit_ , newkey,
                 //                imc::keys.at(newkey).description_, version );
-                imc::block blk(itkey,it-buffer_.begin(),
-                                     it-buffer_.begin()+pos+1+length,
+                imc::block blk(itkey,(unsigned long int)(it-buffer_.begin()),
+                                     (unsigned long int)(it-buffer_.begin()+pos+1+length),
                                      raw_file_, &buffer_);
 
                 // add block to list
                 rawblocks_.push_back(blk);
 
                 // skip the remaining block according to its length
-                if ( it-buffer_.begin()+length < buffer_.size() )
+                if ( (unsigned long int)(it-buffer_.begin()+length) < (unsigned long int)(buffer_.size()) )
                 {
                   std::advance(it,length);
                 }
@@ -253,7 +253,7 @@ namespace imc
     // provide buffer size
     unsigned long int buffer_size()
     {
-      return buffer_.size();
+      return (unsigned long int)buffer_.size();
     }
 
     // get blocks
@@ -377,7 +377,7 @@ namespace imc
         std::filesystem::path pf = pd / filenam;
 
         // and print the channel
-        it->second.print(pf,sep);
+        it->second.print(pf.u8string(),sep);
       }
     }