(Swift 2) Date/Time Expires Within N Seconds/Minutes/Hours/Days

Demonstrates the how to tell if a date/time is within N seconds, minutes, hours, or days of the current system time.

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func chilkatTest() {
    let dt = CkoDateTime()

    // Set to the current system date/time.
    dt.SetFromCurrentSystemTime()
    print("Now: \(dt.GetAsTimestamp(true))")

    // Add 10 minutes, making the date 10 minutes in the future.
    dt.AddSeconds(600)
    print("10 minutes from now: \(dt.GetAsTimestamp(true))")

    // Is the date/time within 10 seconds of expiration (i.e. within 10 seconds of now)?
    var b: Bool = dt.ExpiresWithin(10, units: "seconds")
    print("Expires within 10 seconds: \(b)")

    // Does the date/time expire within 5 minutes?
    b = dt.ExpiresWithin(5, units: "minutes")
    print("Expires within 5 minutes: \(b)")

    // Does the date/time expire within 15 minutes?
    b = dt.ExpiresWithin(15, units: "minutes")
    print("Expires within 15 minutes: \(b)")

    // Does the date/time expire within 1 hour?
    b = dt.ExpiresWithin(1, units: "hour")
    print("Expires within 1 hour: \(b)")

    // Does the date/time expire within 1 day?
    b = dt.ExpiresWithin(1, units: "day")
    print("Expires within 1 day: \(b)")

    // Output:

    // 	Now: 2017-05-05T23:48:00-0500
    // 	10 minutes from now: 2017-05-05T23:58:00-0500
    // 	Expires within 10 seconds: False
    // 	Expires within 5 minutes: False
    // 	Expires within 15 minutes: True
    // 	Expires within 1 hour: True
    // 	Expires within 1 day: True

}