"%1 %2 %3 %4 %5" needs translators' comment

Please explain what the placeholders in the following sring stand for:

    %1 %2 %3 %4 %5
    Located in ../AgendaView.qml:183

Same for:

    %1 %2
    Located in ../DayView.qml:155 ../MonthView.qml:144 ../WeekView.qml:178

    %1 %2 %3 - %4 %5 %6 (All Day)
    Located in ../EventDetails.qml:143

    %1 %2 %3 (All Day)
    Located in ../EventDetails.qml:153

    %1 %2 %3, %4 - %5 %6 %7, %8
    Located in ../EventDetails.qml:162

    %1 %2 %3, %4 - %5
    Located in ../EventDetails.qml:171

    %1 %2 %3
   Located in ../HeaderDateComponent.qml:90

Also, in

    Wk
    Located in ../MonthComponent.qml:262

What is the character limit here?