From 73020685ee765c7c577c849db33fd896a14c905d Mon Sep 17 00:00:00 2001
From: Jesse Haber-Kucharsky <jhaberku@scylladb.com>
Date: Wed, 21 Jun 2017 10:46:16 -0400
Subject: [PATCH] Add `time_t` conversions for `gc_clock`

`gc_clock` reports system time, and these conversion functions allow for
manipulating time points produced by the clock without making assumptions about
its epoch.
---
 gc_clock.hh | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/gc_clock.hh b/gc_clock.hh
index 2d66c6612e..ffc9796fa5 100644
--- a/gc_clock.hh
+++ b/gc_clock.hh
@@ -42,6 +42,14 @@ public:
     using duration = std::chrono::duration<rep, period>;
     using time_point = std::chrono::time_point<gc_clock, duration>;
 
+    static constexpr std::time_t to_time_t(time_point t) {
+        return std::chrono::duration_cast<std::chrono::seconds>(t.time_since_epoch()).count();
+    }
+
+    static constexpr time_point from_time_t(std::time_t t) {
+        return time_point(std::chrono::duration_cast<duration>(std::chrono::seconds(t)));
+    }
+
     static time_point now() {
         return time_point(std::chrono::duration_cast<duration>(base::now().time_since_epoch())) + get_clocks_offset();
     }