2 files changed, 14 insertions, 0 deletions
diff --git a/lib/chronology.cpp b/lib/chronology.cpp
new file mode 100644
index 0000000..8707bba
--- /dev/null
+++ b/lib/chronology.cpp
@@ -0,0 +1,12 @@
+#include "chronology.h"
+
+time_t
+operator""_time_t(const char * iso, size_t)
+{
+	struct tm tm {};
+
+	if (const auto end = strptime(iso, "%FT%T", &tm); !end || *end) {
+		throw std::invalid_argument("Invalid date");
+	}
+	return mktime(&tm);
+}
diff --git a/lib/chronology.h b/lib/chronology.h
index 1980116..688a1f7 100644
--- a/lib/chronology.h
+++ b/lib/chronology.h
@@ -1,5 +1,7 @@
 #pragma once
 
 #include <chrono>
+#include <ctime>
 
 using TickDuration = std::chrono::duration<float, std::chrono::seconds::period>;
+time_t operator""_time_t(const char * iso, size_t);