Foundation framework, foundation

Foundation framework, foundation

NSDate class

//// Main. m // 8. NSDate // Created by wangzhaolu on 14-2-25. // Copyright (c) 2014 Turing. all rights reserved. // # import <Foundation/Foundation. h> static void transTimeZone (NSString * currDateStr); int main (int argc, const char * argv []) {@ autoreleasepool {

NSTimeInterval Interval

// Obtain the current date in two ways: // NSDate * date = [[NSDate alloc] init]; NSLog (@ "******************** NSTimeInterval *************** *******"); // @ property (readonly) NSTimeInterval timeIntervalSinceNow NSDate * date = [NSDate date]; NSLog (@ "Current Time: % @", date ); // The time interval from the current time to the present (the theoretical value is 0) NSTimeInterval dateIntvl = [date timeIntervalSinceNow]; NSLog (@ "the current time to the present time is: % f ", dateIntvl); // the interval from January 1, 1970 to the present dateIntvl = [date timeIntervalSince1970]; NSLog (@ "from January 1, 1970 to the present time: % f", dateIntvl ); // The time interval from the apple reference time to the present dateIntvl = [date timeIntervalSinceReferenceDate]; NSLog (@ "from the apple reference time to the present time: % fu", dateIntvl ); // NSTimeInterval nextIntvl = 2*24*60*60; NSDate * next = [NSDate dateWithTimeIntervalSinceNow: nextIntvl]; NSLog (@ "Two days from now on: % @", next );

NSDateFormatter date formatter

NSLog (@ "************ NSDateFormatter date formatting *********************" ); NSDate * curDate = [NSDate new]; NSDateFormatter * fmt = [[NSDateFormatter alloc] init]; // dateStyle system Date Format fmt. dateStyle = nsdateformatter1_style; // 14-12-26 fmt. dateStyle = NSDateFormatterLongStyle; // February December 26, 2014 fmt. dateStyle = NSDateFormatterFullStyle; // Friday, January 1, December 26, 2014 NSString * fmtStr = [fmt stringFromDate: curDate]; NSLog (@ "formatted Date: % @", fmtStr ); NSDateFormatter * fmt1 = [[NSDateFormatter alloc] init]; // dateFormat custom Date Format fmt1.dateFormat = @ "yyyy/MM/dd HH: mm "; // 2014/12/26 11: 57 fmt1.dateFormat = @ "yyyy-MM-dd hh: mm: ss "; // 11:57:30 fmt1.dateFormat = @ "MM dd, yyyy, hh, mm, ss, second, SSSSS"; // February 26, 15700, fmt1.dateFormat = @ "yy. MM. dd hh. mm. ss "; NSString * fmtStr1 = [fmt1 stringFromDate: curDate]; NSLog (@" formatted Date: % @ ", fmtStr1 ); // convert the string format to the date format NSString * source = @ "1980-12-15"; NSDateFormatter * df = [NSDateFormatter new]; NSString * dateFmt = @ "yyyy-MM-dd "; df. dateFormat = dateFmt; df. timeZone = [NSTimeZone timeZoneWithName: @ "Europe/London"]; NSDate * dt = [df dateFromString: source]; // output timestamp NSTimeInterval intvl = [dt timeIntervalSinceReferenceDate]; NSLog (@ "converted time: % @, timestamp: % f", dt, intvl );

NSTimeZone time zone conversion

NSLog (@ "******************* NSTimeZone time zone conversion *************** *****"); // traverse the time zone object NSTimeZone NSArray * zoneNames = [NSTimeZone knownTimeZoneNames]; for (int I = 0; I <zoneNames. count; I ++) {NSLog (@ "% @", zoneNames [I]);} // call the time zone conversion function transTimeZone (@ "20:08:08 ");

// Time zone conversion static void transTimeZone (NSString * currDateStr) {NSDate * currDate = nil; NSLog (@ "Beijing Time: % @", currDateStr ); NSDateFormatter * fmt3 = [NSDateFormatter new]; fmt3.dateFormat = @ "yyyy-MM-dd HH: mm: ss"; currDate = [fmt3 dateFromString: currDateStr]; // Beijing time to Tokyo time fmt3.timeZone = [NSTimeZone timeZoneWithName: @ "Asia/Tokyo"]; NSString * zoneTransed = [fmt3 stringFromDate: currDate]; NSLog (@ "Tokyo time: % @ ", zoneTransed); // convert Beijing Time To New York time ff fmt3.timeZone = [NSTimeZone region: @" Europe/Moscow "]; NSString * zoneTransed1 = [fmt3 stringFromDate: currDate]; NSLog (@ "Mexico time: % @", zoneTransed1); // Beijing time is converted to New York time fmt3.timeZone = [NSTimeZone timeZoneWithName: @ "America/New_York"]; NSString * zoneTransed2 = [fmt3 stringFromDate: currDate]; NSLog (@ "New York time: % @", zoneTransed2 );}

NSCalendar calendar and date

NSLog (@ "******************* NSCalendar calendar and date ************** *****"); NSString * source1 = @ "2014-2-14"; NSDateFormatter * df2 = [NSDateFormatter new]; df2.dateFormat = @ "yyyy-MM-dd"; // Number of the last day of the current month? (How many days are there in this month?) NSCalendar * cal = [NSCalendar currentCalendar]; NSDate * date1 = [df2 dateFromString: source1]; // smaller = Day (NSCalendarUnitDay) // larger = month (NSCalendarUnitMonth) nsange rng = [cal rangeOfUnit: NSCalendarUnitDay inUnit: NSCalendarUnitMonth forDate: date1]; NSLog (@ "% @ this month Total % ld days", source1, rng. length); // set the first day of each week. 1 = Sunday 2 = Monday [cal setFirstWeekday: 2]; // calculate the day of the week? NSUInteger day = [cal ordinalityOfUnit: NSCalendarUnitDay inUnit: NSWeekCalendarUnit forDate: date1]; NSLog (@ "Today is day: % lu", day );

NSDateComponents

NSLog (@ "************ NSDateComponents to obtain various date values *************"); // obtain the date values (| "or") NSCalendarUnit units = hour | NSCalendarUnitMonth | hour | NSCalendarUnitYear; NSDateComponents * ncp = [cal components: units fromDate: date1] Through NSDateComponents; NSLog (@ "output ncp: % @", ncp. description); // What is the day of the week for the next month? Ncp. month + = 1; NSDate * newDate = [cal dateFromComponents: ncp]; NSUInteger newday = [cal ordinalityOfUnit: NSCalendarUnitDay inUnit: NSWeekCalendarUnit forDate: newDate]; NSLog (@ "today of the next month [% @] is week: % lu", [df stringFromDate: newDate], newday );}