(Swift 3,4,5...) Date/Time Older-Than N Seconds/Minutes/Hours/Days

Demonstrates the how to tell if a date/time is older than the current time by N seconds, minutes, hours, or days.

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func chilkatTest() {
    let dt = CkoDateTime()!

    // Set to the current system date/time.
    dt.setFromCurrentSystemTime()
    print("Now: \(dt.getAsTimestamp(true)!)")

    // Subtract 10 minutes, making the date 10 minutes in the past.
    dt.addSeconds(-600)
    print("10 minutes ago: \(dt.getAsTimestamp(true)!)")

    // Is the date/time older than 10 seconds?
    var b: Bool = dt.olderThan(10, units: "seconds")
    print("Older than 10 seconds: \(b)")

    // Is the date/time older than 5 minutes?
    b = dt.olderThan(5, units: "minutes")
    print("Older than 5 minutes: \(b)")

    // Is the date/time older than 15 minutes?
    b = dt.olderThan(15, units: "minutes")
    print("Older than 15 minutes: \(b)")

    // Is the date/time older than 1 hour?
    b = dt.olderThan(1, units: "hour")
    print("Older than 1 hour: \(b)")

    // Is the date/time older than 1 day?
    b = dt.olderThan(1, units: "day")
    print("Older than 1 day: \(b)")

    // Output:

    // 	Now: 2017-05-05T23:33:06-0500
    // 	10 minutes ago: 2017-05-05T23:23:06-0500
    // 	Older than 10 seconds: True
    // 	Older than 5 minutes: True
    // 	Older than 15 minutes: False
    // 	Older than 1 hour: False
    // 	Older than 1 day: False

}