From 2414f6b3d4f655f765d3831679bc9bfe21f9fc84 Mon Sep 17 00:00:00 2001
From: Paul Beckingham <paul@beckingham.net>
Date: Sat, 26 Sep 2015 18:42:32 -0400
Subject: [PATCH] ISO8601d: Added ::toISO

---
 src/ISO8601.cpp | 20 ++++++++++++++++++++
 src/ISO8601.h   |  1 +
 2 files changed, 21 insertions(+)

diff --git a/src/ISO8601.cpp b/src/ISO8601.cpp
index fb1332f56..1f2765f38 100644
--- a/src/ISO8601.cpp
+++ b/src/ISO8601.cpp
@@ -26,6 +26,7 @@
 
 #include <cmake.h>
 #include <sstream>
+#include <iomanip>
 #include <stdlib.h>
 #include <assert.h>
 #include <Lexer.h>
@@ -854,6 +855,25 @@ std::string ISO8601d::toEpochString ()
   return epoch.str ();
 }
 
+////////////////////////////////////////////////////////////////////////////////
+// 19980119T070000Z =  YYYYMMDDThhmmssZ
+std::string ISO8601d::toISO ()
+{
+  struct tm* t = gmtime (&_date);
+
+  std::stringstream iso;
+  iso << std::setw (4) << std::setfill ('0') << t->tm_year + 1900
+      << std::setw (2) << std::setfill ('0') << t->tm_mon + 1
+      << std::setw (2) << std::setfill ('0') << t->tm_mday
+      << "T"
+      << std::setw (2) << std::setfill ('0') << t->tm_hour
+      << std::setw (2) << std::setfill ('0') << t->tm_min
+      << std::setw (2) << std::setfill ('0') << t->tm_sec
+      << "Z";
+
+  return iso.str ();
+}
+
 ////////////////////////////////////////////////////////////////////////////////
 double ISO8601d::toJulian ()
 {
diff --git a/src/ISO8601.h b/src/ISO8601.h
index 87730df8c..cf4824f23 100644
--- a/src/ISO8601.h
+++ b/src/ISO8601.h
@@ -48,6 +48,7 @@ public:
 
   time_t toEpoch ();
   std::string toEpochString ();
+  std::string toISO ();
   double toJulian ();
   void toMDY (int&, int&, int&);