Check if time is falling under specific timeframe

Question

I have a variable that stores a time value.

var cabtime = ["09:30:00"];

Variable time value is in 24-hour clock. That means 02:30:0PM will come as 14:30:00.

I want to check if the variable time falls under 08:00AM to 10:00AM window. If yes then I'll do an action.

Any pointers in this regard?

Answer 1

You could parse the time into seconds since midnight using:

var cabtime = ["HH:MM:SS"] // in 24hr time

function parseTime (string) {
    parts = string.split(':').map(x => parseInt(x))
    seconds = parts[0] * 3600 + parts[1] * 60 + parts[0]
    return seconds
}

Then you can parse the time and the upper/lower bounds, and test using:

time = parseTime(cabtime[0])
lower = parseTime('08:00:00')
upper = parseTime('10:00:00')

if (time >= lower && time <= upper) {
    print('Inside the range')
}

Answer 2

You can solve it easily by converting your strings to Date objects and compare them than.

var cabtime = ["09:30"];

function checkTimeRange(time, from, to, reldate) {
    if (undefined === reldate) {
        reldate = '0000T'; // the date the time strings are related to
    }

    let dtime = new Date(reldate + time);
    let dfrom = new Date(reldate + from);
    let dto   = new Date(reldate + to);

    return dfrom <= dtime && dtime <= dto;
}

checkTimeRange(cabtime[0], '08:00', '10:00'); // returns true

If you have full dates (e.g. '2019-07-25T09:30:00') instead of just the clock time you should provide for the parameter `reldate' an empty string.

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* update: changed the wrong date format to standard format

* update: changed the date format again to be more fancy