int is dead, long live long type!

ml_date.cpp

@@ -1,15 +1,15 @@
 
 #include "ml_date.h"
 
-int now() {
+long now() {
 	// get-universal-time
 	time_t t = std::time(0);
 	long int now = static_cast<long int>(t);
 
-	return (int) now;
+	return now;
 }
 
-std::string date_to_string(const int datetime, const std::string format) {
+std::string date_to_string(const long datetime, const std::string format) {
 	// std::locale::global(std::locale("en-US.UTF8"));
 
 	time_t timestamp = datetime;
@@ -23,16 +23,16 @@ std::string date_to_string(const int datetime, const std::string format) {
     return "invalid argument";
 }
 
-int string_to_date(const std::string &datestr, const std::string &format) {
+long string_to_date(const std::string &datestr, const std::string &format) {
 	// format for example "%d.%m.%Y";
 
 	std::istringstream in{datestr.c_str()};
 	date::sys_seconds tp;
 	in >> date::parse(format, tp);
-	return (int) tp.time_since_epoch().count();
+	return tp.time_since_epoch().count();
 }
 
-int add_to_date(const int datetime, const int quantity, const std::string &part) {
+long add_to_date(const long datetime, const long quantity, const std::string &part) {
 	// part is one of 'year', 'month', 'day', 'hour', 'minute' or 'second'
 
 	// very basic implementation, just for now - no timezones DST etc
@@ -55,5 +55,5 @@ int add_to_date(const int datetime, const int quantity, const std::string &part)
 		// TODO exception here
 	}
 
-	return (int) mktime(tm);
+	return mktime(tm);
 }