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diff --git a/src/common/human_time_diff.hpp b/src/common/human_time_diff.hpp
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+++ b/src/common/human_time_diff.hpp
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+#ifndef TMWA_COMMON_HUMAN_TIME_DIFF_HPP
+#define TMWA_COMMON_HUMAN_TIME_DIFF_HPP
+//    human_time_diff.hpp - broken deltas
+//
+//    Copyright © 2013 Ben Longbons <b.r.longbons@gmail.com>
+//
+//    This file is part of The Mana World (Athena server)
+//
+//    This program 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/>.
+
+#include "sanity.hpp"
+
+#include "extract.hpp"
+#include "strings.hpp"
+
+struct HumanTimeDiff
+{
+    short year, month, day, hour, minute, second;
+
+    explicit
+    operator bool()
+    {
+        return year || month || day || hour || minute || second;
+    }
+
+    bool operator !()
+    {
+        return !bool(*this);
+    }
+};
+
+inline
+bool extract(XString str, HumanTimeDiff *iv)
+{
+    // str is a sequence of [-+]?[0-9]+([ay]|m|[jd]|h|mn|s)
+    // there are NO spaces here
+    // parse by counting the number starts
+    auto is_num = [](char c)
+    { return c == '-' || c == '+' || ('0' <= c && c <= '9'); };
+    if (!str || !is_num(str.front()))
+        return false;
+    *iv = HumanTimeDiff{};
+    while (str)
+    {
+        auto it = std::find_if_not(str.begin(), str.end(), is_num);
+        auto it2 = std::find_if(it, str.end(), is_num);
+        XString number = str.xislice_h(it);
+        XString suffix = str.xislice(it, it2);
+        str = str.xislice_t(it2);
+
+        short *ptr = nullptr;
+        if (suffix == "y" || suffix == "a")
+            ptr = &iv->year;
+        else if (suffix == "m")
+            ptr = &iv->month;
+        else if (suffix == "j" || suffix == "d")
+            ptr = &iv->day;
+        else if (suffix == "h")
+            ptr = &iv->hour;
+        else if (suffix == "mn")
+            ptr = &iv->minute;
+        else if (suffix == "s")
+            ptr = &iv->second;
+        else
+            return false;
+        if (number.startswith('+') && !number.startswith("+-"))
+            number = number.xslice_t(1);
+        if (*ptr || !extract(number, ptr))
+            return false;
+    }
+    return true;
+}
+
+#endif // TMWA_COMMON_HUMAN_TIME_DIFF_HPP