Has anyone seen this? It started happening since we upgraded to 4.7.1. The strange thing is you reload several times the same exact page and goes away.
Error: Call to undefined method DateTime::getDateInformation() (0)
#0 /.../public_html/applications/calendar/sources/Event/Event.php(363): IPS\calendar\_Event::_findOccurances(Object(IPS\calendar\Date), Object(IPS\calendar\Date), Object(IPS\calendar\Date), Object(IPS\calendar\Date), Array)
#1 /.../public_html/applications/calendar/sources/Event/Event.php(2127): IPS\calendar\_Event->findOccurrences(Object(IPS\calendar\Date), Object(IPS\calendar\Date))
#2 /.../public_html/applications/calendar/widgets/upcomingEvents.php(153): IPS\calendar\_Event::retrieveEvents(Object(IPS\calendar\Date), NULL, Array, 3, false)
#3 /.../public_html/system/Widget/Widget.php(833): IPS\calendar\widgets\_upcomingEvents->render()
#4 /.../public_html/system/Widget/Widget.php(888): IPS\_Widget->_render()
#5 /.../public_html/uploads/template_9_94a9d7649fb9cdbfc784d3516e61a717_global.php(18109): IPS\_Widget->__toString()
#6 /.../public_html/system/Theme/SandboxedTemplate.php(61): IPS\Theme\Cache\class_core_front_global->widgetContainer('sidebar', 'vertical')
#7 /.../public_html/uploads/template_9_94a9d7649fb9cdbfc784d3516e61a717_global.php(15346): IPS\Theme\_SandboxedTemplate->__call('widgetContainer', Array)
#8 /.../public_html/system/Theme/SandboxedTemplate.php(61): IPS\Theme\Cache\class_core_front_global->sidebar('right')
#9 /.../public_html/uploads/template_9_94a9d7649fb9cdbfc784d3516e61a717_global.php(6644): IPS\Theme\_SandboxedTemplate->__call('sidebar', Array)
#10 /.../public_html/system/Theme/SandboxedTemplate.php(61): IPS\Theme\Cache\class_core_front_global->globalTemplate('2d737942c45c6b6...', '\n\n<div class='i...', Array)
#11 /.../public_html/system/Dispatcher/Dispatcher.php(173): IPS\Theme\_SandboxedTemplate->__call('globalTemplate', Array)
#12 /.../public_html/system/Dispatcher/Standard.php(113): IPS\_Dispatcher->finish()
#13 /.../public_html/system/Dispatcher/Front.php(625): IPS\Dispatcher\_Standard->finish()
#14 /.../public_html/system/Dispatcher/Dispatcher.php(155): IPS\Dispatcher\_Front->finish()
#15 /.../public_html/index.php(13): IPS\_Dispatcher->run()
#16 {main}