Due Today.omnijs

/*{

    "type": "action",
    "targets": ["omnifocus"],
    "author": "Nicholas Riley",
    "identifier": "net.sabi.omnifocus.MakeDueToday",
    "version": "1.0.2",
    "description": "Make the selected tasks due today.",
    "defaultLocale": "en",
    "label": "Make Due Today",
    "shortLabel": "Today",
    "image": "calendar"
}*/
/// <reference path="OmniFocus.d.ts" />
(() => {
    const dueHour = 21; // if no existing due time - change if desired

    var action = new PlugIn.Action(selection => {
        const dueDateAddingDays = (date, days) => {
            if (days) date.setDate(days + date.getDate());
            date.setHours(dueHour);
            date.setMinutes(0);
            date.setSeconds(0);
            date.setMilliseconds(0);
            return date;
        };

        const tasks = selection.tasks;
        const calendar = Calendar.current;
        const today = dueDateAddingDays(new Date(), 0);

        tasks.forEach(task => {
            var dueDate = task.dueDate;
            if (dueDate === null) dueDate = today;
            else {
                var timeOffset = calendar.startOfDay(today).getTime() - calendar.startOfDay(dueDate).getTime();
                dueDate.setTime(dueDate.getTime() + timeOffset);
            }
            task.dueDate = dueDate;
        });
    });

    action.validate = selection =>
        selection.tasks.length > 0;

    return action;
})();