diff --git a/src/oro/api_nap.cpp b/src/oro/api_nap.cpp
index 2a2889a..a7be2fc 100644
--- a/src/oro/api_nap.cpp
+++ b/src/oro/api_nap.cpp
@@ -30,7 +30,7 @@ Header to_header (const nap::HttpResponse& resp) {
 	Header ret;
 	for (const auto& entry : resp.header) {
 		if (entry.first == "Date")
-			ret.date = from_header_timestamp(entry.second);
+			ret.date = from_header_timestamp(std::string(entry.second));
 		else if (entry.first == "X-RateLimit-Limit")
 			ret.rate_limit = int_conv<decltype(ret.rate_limit)>(entry.second);
 		else if (entry.first == "X-RateLimit-Remaining")
diff --git a/src/oro/datatypes.cpp b/src/oro/datatypes.cpp
index 5e7da46..b2c66f4 100644
--- a/src/oro/datatypes.cpp
+++ b/src/oro/datatypes.cpp
@@ -22,8 +22,8 @@
 #include "date/date.h"
 
 namespace oro {
-	Timestamp& Timestamp::operator= (const std::string& str) {
-		ts = from_json_timestamp(str);
+	Timestamp& Timestamp::operator= (std::string&& str) {
+		ts = from_json_timestamp(std::move(str));
 		return *this;
 	}
 
diff --git a/src/oro/datatypes.hpp b/src/oro/datatypes.hpp
index 8edccd9..8a18b09 100644
--- a/src/oro/datatypes.hpp
+++ b/src/oro/datatypes.hpp
@@ -25,7 +25,7 @@ namespace oro {
     typedef std::chrono::time_point<std::chrono::system_clock, std::chrono::microseconds> timestamp_t;
 
 	struct Timestamp {
-		Timestamp& operator= (const std::string& str);
+		Timestamp& operator= (std::string&& str);
 		operator timestamp_t() const { return ts; }
 
 		timestamp_t ts;
diff --git a/src/oro/private/dateconv.cpp b/src/oro/private/dateconv.cpp
index 911ad1e..5a223f7 100644
--- a/src/oro/private/dateconv.cpp
+++ b/src/oro/private/dateconv.cpp
@@ -32,8 +32,8 @@ namespace {
 		}
 	};
 
-	Timestamp to_timestamp (const char* fmt, std::string_view str) {
-		std::istringstream iss{std::string(str)};
+	Timestamp to_timestamp (const char* fmt, std::string&& str) {
+		std::istringstream iss{std::move(str)};
 		Timestamp ts;
 		date::from_stream(iss, fmt, ts.ts);
 		return ts;
@@ -45,29 +45,25 @@ namespace {
 //For formatting modifiers see:
 //https://howardhinnant.github.io/date/date.html#from_stream_formatting
 
-Timestamp from_json_timestamp (const std::string& str) {
+Timestamp from_json_timestamp (std::string&& str) {
 	if (not str.empty() and str.back() == 'Z') {
 		//date has this format: 2020-06-19T22:40:51Z
-		return to_timestamp("%FT%TZ", str);
+		return to_timestamp("%FT%TZ", std::move(str));
 	}
 	else {
 		//date has this format: 2020-06-19T22:33:36.855672+00:00
-		return to_timestamp("%FT%T%Ez", str);
+		return to_timestamp("%FT%T%Ez", std::move(str));
 	}
 }
 
-Timestamp from_header_timestamp (const std::string& str) {
-	return from_header_timestamp(std::string_view(str));
-}
-
-Timestamp from_header_timestamp (std::string_view str) {
+Timestamp from_header_timestamp (std::string&& str) {
 	UniqueLocale loc(std::setlocale(LC_TIME, "POSIX"));
 	//date has this format: Fri, 19 Jun 2020 22:33:43 GMT
-	return to_timestamp("%a, %d %b %Y %T %Z", str);
+	return to_timestamp("%a, %d %b %Y %T %Z", std::move(str));
 }
 
-Timestamp from_sqlite_timestamp (const std::string& str) {
-	return to_timestamp("%F %T", str);
+Timestamp from_sqlite_timestamp (std::string&& str) {
+	return to_timestamp("%F %T", std::move(str));
 }
 
 std::string to_sqlite_string (const oro::Timestamp& ts) {
diff --git a/src/oro/private/dateconv.hpp b/src/oro/private/dateconv.hpp
index 361f137..33ca1b7 100644
--- a/src/oro/private/dateconv.hpp
+++ b/src/oro/private/dateconv.hpp
@@ -19,13 +19,11 @@
 
 #include "oro/datatypes.hpp"
 #include <string>
-#include <string_view>
 
 namespace oro {
-Timestamp from_json_timestamp (const std::string& str);
-Timestamp from_header_timestamp (std::string_view str);
-Timestamp from_header_timestamp (const std::string& str);
-Timestamp from_sqlite_timestamp (const std::string& str);
+Timestamp from_json_timestamp (std::string&& str);
+Timestamp from_header_timestamp (std::string&& str);
+Timestamp from_sqlite_timestamp (std::string&& str);
 std::string to_sqlite_string (const Timestamp& ts);
 std::string to_iso8601_string (const Timestamp& ts);
 } //namespace oro
diff --git a/src/oro/private/originsdb_sqlite.cpp b/src/oro/private/originsdb_sqlite.cpp
index 4fff2c7..94baa81 100644
--- a/src/oro/private/originsdb_sqlite.cpp
+++ b/src/oro/private/originsdb_sqlite.cpp
@@ -556,7 +556,7 @@ Timestamp OriginsDBSQLite::next_access_time (DBOperation op) const {
 	if (not info)
 		throw std::runtime_error("Query returned no value for access.operation " + to_string(static_cast<int>(op)));
 
-	return from_sqlite_timestamp(*info);
+	return from_sqlite_timestamp(std::move(*info));
 }
 
 } //namespace oro