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Editorial Team
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Asked: 2026-05-21T03:37:29+00:00

How best could I store day-of-week and a time within core data? For example:

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How best could I store day-of-week and a time within core data? For example:

  • Mon 4.05am
  • Wed 8.10pm

I can represent this within Objective-C using NSDateComponents however this type isn’t listed in the core data attributes type drop down list. For that matter these doesn’t seem to be an NSTime type either in Objective-C or core data. Options that come to mind:

  • store as string and then have to parse (e.g. “Mon 5.00pm”) however that doesn’t sound ideal
  • store as (a) NSInteger for day-of-week, and (b) NSDate for time, and only use the time portion when accessing later?
  • other better ideas?
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1 Answer

  1. Editorial Team

    If the classes representing your data conform to the NSCoding protocol you can make use of Transformable Attributes. A short quote from Apple’s chapter Non-Standard Persistent Attributes pf Core Data Programming Guide:

    The idea behind transformable
    attributes is that you access an
    attribute as a non-standard type, but
    behind the scenes Core Data uses an
    instance of NSValueTransformer to
    convert the attribute to and from an
    instance of NSData. Core Data then
    stores the data instance to the
    persistent store.

    NSDateComponent does conform to the protocol 🙂

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