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iosobjective-cswiftnsdatensdatecomponents

Extract all date components from a Date

(I was surprised that I could not find this question asked anywhere, it sounds so basic. I might be missing something...)

Is there a way to create a DateComponents() object that exactly matches a Date/NSDate object (date, time, calendar, timeZone), without having to specify all the components we want to include?

Example of a concrete use case: the UNCalendarNotificationTrigger init method takes DateComponents as an argument, and we'd like to set that notification to a specific date and time kept as a Date/NSDate object, whose dateComponents we therefore need to extract.

Solution

  • You can use Calendar.dateComponents(in:,from:) to achieve your goals. This way you only need to supply the TimeZone and can extract all DateComponents from a Date object.

    let components = Calendar.current.dateComponents(in: TimeZone.current, from: Date())