From b16d51e7d108c50e960d4598cb7cd47854c76f3e Mon Sep 17 00:00:00 2001
From: Dan Goodliffe <dan@randomdan.homeip.net>
Date: Thu, 19 Sep 2024 19:55:14 +0100
Subject: Add helper to quickly parse an ISO date/time

---
 lib/chronology.cpp | 12 ++++++++++++
 lib/chronology.h   |  2 ++
 2 files changed, 14 insertions(+)
 create mode 100644 lib/chronology.cpp

(limited to 'lib')

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);
-- 
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