Fix issues with year 2038 (#3052)

* Fix annotations in year 2038

Fixes #3050

* Ensure 32-bit systems work better after 2038

Without this patch, their 32-bit signed long int could overflow.

This patch was done while working on reproducible builds for openSUSE.

src/commands/CmdInfo.cpp

@@ -240,7 +240,7 @@ int CmdInfo::execute (std::string& output)
     auto created = task.get ("entry");
     if (created.length ())
     {
-      Datetime dt (strtol (created.c_str (), nullptr, 10));
+      Datetime dt (strtoll (created.c_str (), nullptr, 10));
       age = Duration (now - dt).formatVague ();
     }