Update for Swift 3: let date = Date() let calendar = Calendar.current let hour = calendar.component(.hour, from: date) let minutes = calendar.component(.minute, from: date) I do this: let date = NSDate() let calendar = NSCalendar.currentCalendar() let components = calendar.components(.CalendarUnitHour | .CalendarUnitMinute, fromDate: date) let hour = components.hour let minutes = components.minute See the same question … Read more
Is one just an extension? Pretty much, yes – RFC 3339 is listed as a profile of ISO 8601. Most notably RFC 3339 specifies a complete representation of date and time (only fractional seconds are optional). The RFC also has some small, subtle differences. For example truncated representations of years with only two digits are … Read more
(StartA <= EndB) and (EndA >= StartB) Proof: Let ConditionA Mean that DateRange A Completely After DateRange B _ |—- DateRange A ——| |—Date Range B —–| _ (True if StartA > EndB) Let ConditionB Mean that DateRange A is Completely Before DateRange B |—- DateRange A —–| _ _ |—Date Range B —-| (True … Read more
Summary of answers and other data: (please add yours) Do: Whenever you are referring to an exact moment in time, persist the time according to a unified standard that is not affected by daylight savings. (GMT and UTC are equivalent with this regard, but it is preferred to use the term UTC. Notice that UTC … Read more