v0.2.54..v0.2.55 changeset DateTimeUtils.cpp

diff --git a/hoot-core/src/main/cpp/hoot/core/util/DateTimeUtils.cpp b/hoot-core/src/main/cpp/hoot/core/util/DateTimeUtils.cpp
new file mode 100644
index 0000000..7f529fb
--- /dev/null
+++ b/hoot-core/src/main/cpp/hoot/core/util/DateTimeUtils.cpp
@@ -0,0 +1,73 @@
+/*
+ * This file is part of Hootenanny.
+ *
+ * Hootenanny is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ *
+ * --------------------------------------------------------------------
+ *
+ * The following copyright notices are generated automatically. If you
+ * have a new notice to add, please use the format:
+ * " * @copyright Copyright ..."
+ * This will properly maintain the copyright information. DigitalGlobe
+ * copyrights will be updated automatically.
+ *
+ * @copyright Copyright (C) 2020 DigitalGlobe (http://www.digitalglobe.com/)
+ */
+
+#include "DateTimeUtils.h"
+
+// Hoot
+#include <hoot/core/util/HootException.h>
+#include <hoot/core/util/Log.h>
+
+// Qt
+#include <QDateTime>
+#include <QRegExp>
+
+namespace hoot
+{
+
+QString DateTimeUtils::toTimeString(quint64 timestamp)
+{
+  // convert time in seconds since epoch into timestamp string
+  QDateTime dt;
+  dt.setTimeSpec(Qt::UTC);
+  dt.setMSecsSinceEpoch(timestamp*1000);
+  return dt.toString("yyyy-MM-ddThh:mm:ssZ");
+}
+
+quint64 DateTimeUtils::fromTimeString(QString timestamp)
+{
+  //2016-05-04T22:07:19Z
+  QRegExp timestampRegex("\\d{4}-\\d{2}-\\d{2}T\\d{2}:\\d{2}:\\d{2}Z*");
+  if (!timestampRegex.exactMatch(timestamp))
+  {
+    throw IllegalArgumentException("Invalid timestamp string: " + timestamp);
+  }
+
+  struct tm t;
+  strptime(timestamp.toStdString().c_str(), "%Y-%m-%dT%H:%M:%SZ", &t);
+
+  // calc time in seconds since epoch
+  return (quint64)(t.tm_sec + t.tm_min*60 + t.tm_hour*3600 + t.tm_yday*86400 +
+    (t.tm_year-70)*31536000 + ((t.tm_year-69)/4)*86400 -
+    ((t.tm_year-1)/100)*86400 + ((t.tm_year+299)/400)*86400);
+}
+
+QString DateTimeUtils::currentTimeAsString()
+{
+  return QDateTime::currentDateTime().toString("yyyy-MM-ddThh:mm:ssZ");
+}
+
+}