Convertir NSString a NSDate (y viceversa)
¿Cómo convertir un NSString
como "01/02/10" (significado 1 de febrero de 2010)en un NSDate
? ¿Y cómo podría convertir el NSDate
de nuevo en una cadena?
17 answers
Swift 4 y posteriores
Actualizado: 2018
Cadena hasta la fecha
var dateString = "02-03-2017"
var dateFormatter = DateFormatter()
// This is important - we set our input date format to match our input string
// if the format doesn't match you'll get nil from your string, so be careful
dateFormatter.dateFormat = "dd-MM-yyyy"
//`date(from:)` returns an optional so make sure you unwrap when using.
var dateFromString: Date? = dateFormatter.date(from: dateString)
Fecha a Cadena
var formatter = DateFormatter()
formatter.dateFormat = "dd-MM-yyyy"
guard let unwrappedDate = dateFromString else { return }
//Using the dateFromString variable from before.
let stringDate: String = formatter.string(from: dateFromString)
Swift 3
Actualizado: 20 de julio de 2017
String to NSDate
var dateString = "02-03-2017"
var dateFormatter = DateFormatter()
// This is important - we set our input date format to match our input string
// if the format doesn't match you'll get nil from your string, so be careful
dateFormatter.dateFormat = "dd-MM-yyyy"
var dateFromString = dateFormatter.date(from: dateString)
NSDate to String
var formatter = DateFormatter()
formatter.dateFormat = "dd-MM-yyyy"
let stringDate: String = formatter.string(from: dateFromString)
Swift
Actualizado: 22 de octubre de 2015
String to NSDate
var dateString = "01-02-2010"
var dateFormatter = NSDateFormatter()
// this is imporant - we set our input date format to match our input string
dateFormatter.dateFormat = "dd-MM-yyyy"
// voila!
var dateFromString = dateFormatter.dateFromString(dateString)
Fecha a String
var formatter = NSDateFormatter()
formatter.dateFormat = "dd-MM-yyyy"
let stringDate: String = formatter.stringFromDate(NSDate())
println(stringDate)
Objetivo-C
NSString to NSDate
NSString *dateString = @"01-02-2010";
NSDateFormatter *dateFormatter = [[NSDateFormatter alloc] init];
[dateFormatter setDateFormat:@"dd-MM-yyyy"];
NSDate *dateFromString = [dateFormatter dateFromString:dateString];
NSDate convertir a NSString:
NSDateFormatter *dateFormatter = [[NSDateFormatter alloc] init];
[dateFormatter setDateFormat:@"dd-MM-yyyy"];
NSString *stringDate = [dateFormatter stringFromDate:[NSDate date]];
NSLog(@"%@", stringDate);
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2018-05-29 08:37:13
Hizo una extensión NSString para eso.
// Simple as this.
date = dateString.dateValue;
Gracias a NSDataDetector, reconoce una gran cantidad de formato.
'2014-01-16' dateValue is <2014-01-16 11:00:00 +0000>
'2014.01.16' dateValue is <2014-01-16 11:00:00 +0000>
'2014/01/16' dateValue is <2014-01-16 11:00:00 +0000>
'2014 Jan 16' dateValue is <2014-01-16 11:00:00 +0000>
'2014 Jan 16th' dateValue is <2014-01-16 11:00:00 +0000>
'20140116' dateValue is <2014-01-16 11:00:00 +0000>
'01-16-2014' dateValue is <2014-01-16 11:00:00 +0000>
'01.16.2014' dateValue is <2014-01-16 11:00:00 +0000>
'01/16/2014' dateValue is <2014-01-16 11:00:00 +0000>
'16 January 2014' dateValue is <2014-01-16 11:00:00 +0000>
'01-16-2014 17:05:05' dateValue is <2014-01-16 16:05:05 +0000>
'01-16-2014 T 17:05:05 UTC' dateValue is <2014-01-16 17:05:05 +0000>
'17:05, 1 January 2014 (UTC)' dateValue is <2014-01-01 16:05:00 +0000>
Parte de eppz!kit , agarra la categoría NSString+EPPZKit.h de GitHub.
RESPUESTA ORIGINAL: Si no está seguro (o no le importa) sobre el formato de fecha contenido en la cadena, use NSDataDetector para analizar la fecha.
//Role players.
NSString *dateString = @"Wed, 03 Jul 2013 02:16:02 -0700";
__block NSDate *detectedDate;
//Detect.
NSDataDetector *detector = [NSDataDetector dataDetectorWithTypes:NSTextCheckingAllTypes error:nil];
[detector enumerateMatchesInString:dateString
options:kNilOptions
range:NSMakeRange(0, [dateString length])
usingBlock:^(NSTextCheckingResult *result, NSMatchingFlags flags, BOOL *stop)
{ detectedDate = result.date; }];
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2014-01-16 14:09:46
Al usar fechas de formato fijo, debe establecer la configuración regional del formateador de fechas en "en_US_POSIX"
.
Tomado de la Guía de formato de datos
Si está trabajando con fechas de formato fijo, primero debe establecer la locale del formateador de fecha a algo apropiado para su fijo formato. En la mayoría de los casos, la mejor configuración regional para elegir es en_US_POSIX, un local diseñado específicamente para obtener resultados en inglés estadounidense independientemente del usuario y del sistema preferencias. en_US_POSIX también es invariantes en el tiempo (si la NOSOTROS, en algún momento en el futuro, los cambios de la la forma en que formatea las fechas, en_US cambiará para reflejar el nuevo comportamiento, pero en_US_POSIX no), y entre plataformas (en_US_POSIX funciona lo mismo en iPhone OS como lo hace en OS X, y como lo hace en otros plataforma).
Swift 3 o posterior
extension Formatter {
static let customDate: DateFormatter = {
let formatter = DateFormatter()
formatter.locale = Locale(identifier: "en_US_POSIX")
formatter.dateFormat = "dd/MM/yy"
return formatter
}()
static let time: DateFormatter = {
let formatter = DateFormatter()
formatter.locale = Locale(identifier: "en_US_POSIX")
formatter.dateFormat = "HH:mm"
return formatter
}()
static let weekdayName: DateFormatter = {
let formatter = DateFormatter()
formatter.dateFormat = "cccc"
return formatter
}()
static let month: DateFormatter = {
let formatter = DateFormatter()
formatter.dateFormat = "LLLL"
return formatter
}()
}
extension Date {
var customDate: String {
return Formatter.customDate.string(from: self)
}
var customTime: String {
return Formatter.time.string(from: self)
}
var weekdayName: String {
return Formatter.weekdayName.string(from: self)
}
var monthName: String {
return Formatter.month.string(from: self)
}
}
extension String {
var customDate: Date? {
return Formatter.customDate.date(from: self)
}
}
Uso:
// this will be displayed like this regardless of the user and system preferences
Date().customTime // "16:50"
Date().customDate // "06/05/17"
// this will be displayed according to user and system preferences
Date().weekdayName // "Saturday"
Date().monthName // "May"
Analizar la fecha personalizada y convertir la date back to the same string format:
let dateString = "01/02/10"
if let date = dateString.customDate {
print(date.customDate) // "01/02/10\n"
print(date.monthName) // customDate
}
Aquí están todos los elementos que puede usar para personalizarlo según sea necesario:
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2017-12-04 02:39:40
¿Por qué no agregar una categoría a NSString?
// NSString+Date.h
@interface NSString (Date)
+ (NSDate*)stringDateFromString:(NSString*)string;
+ (NSString*)stringDateFromDate:(NSDate*)date;
@end
// NSString+Date.m
NSDateFormatter *dateFormatter = [[NSDateFormatter alloc]init];
[dateFormatter setDateFormat:@"EEE, dd MMM yyyy HH:mm:ss ZZZ"];
NSDate *date = [dateFormatter dateFromString:stringDate ];
[dateFormatter release];
+ (NSDateFormatter*)stringDateFormatter
{
static NSDateFormatter* formatter = nil;
if (formatter == nil)
{
formatter = [[NSDateFormatter alloc] init];
[formatter setDateFormat:@"EEE, dd MMM yyyy HH:mm:ss ZZZ"];
}
return formatter;
}
+ (NSDate*)stringDateFromString:(NSString*)string
{
return [[NSString stringDateFormatter] dateFromString:string];
}
+ (NSString*)stringDateFromDate:(NSDate*)date
{
return [[NSString stringDateFormatter] stringFromDate:date];
}
// Usage (#import "NSString+Date.h") or add in "YOUR PROJECT".pch file
NSString* string = [NSString stringDateFromDate:[NSDate date]];
NSDate* date = [NSString stringDateFromString:string];
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2017-08-18 14:35:54
Usar "10" para representar un año no es bueno, porque puede ser 1910, 1810, etc. Probablemente deberías usar 4 dígitos para eso.
Si puedes cambiar la fecha a algo como
yyyymmdd
Entonces puedes usar:
// Convert string to date object
NSDateFormatter *dateFormat = [[NSDateFormatter alloc] init];
[dateFormat setDateFormat:@"yyyyMMdd"];
NSDate *date = [dateFormat dateFromString:dateStr];
// Convert date object to desired output format
[dateFormat setDateFormat:@"EEEE MMMM d, YYYY"];
dateStr = [dateFormat stringFromDate:date];
[dateFormat release];
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2014-07-25 07:21:06
NSString *dateStr = @"Tue, 25 May 2010 12:53:58 +0000";
// Convert string to date object
NSDateFormatter *dateFormat = [[NSDateFormatter alloc] init];
[dateFormat setDateFormat:@"EE, d LLLL yyyy HH:mm:ss Z"];
NSDate *date = [dateFormat dateFromString:dateStr];
[dateFormat release];
Warning: date(): Invalid date.timezone value 'Europe/Kyiv', we selected the timezone 'UTC' for now. in /var/www/agent_stack/data/www/ajaxhispano.com/template/agent.layouts/content.php on line 61
2014-02-26 06:53:42
// Convert string to date
NSDateFormatter *dateFormat = [[NSDateFormatter alloc] init];
[dateFormat setDateFormat:@"yyyyMMdd"];
NSDate *date = [dateFormat dateFromString:dateStr];
// Convert Date to string
[dateFormat setDateFormat:@"EEEE MMMM d, YYYY"];
dateStr = [dateFormat stringFromDate:date];
[dateFormat release];
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2012-08-28 10:06:54
NSString *mystr=@"Your string date";
NSCalendar *cal = [NSCalendar currentCalendar];
NSDate *now = [dateFormatter dateFromString:mystr];
Nslog(@"%@",now);
Si desea establecer el formato, use el siguiente código:
NSString *dateString = @"01-02-2010";
NSDateFormatter *dateFormatter = [[NSDateFormatter alloc] init];
// this is important - we set our input date format to match our input string
// if format doesn't match you'll get nil from your string, so be careful
[dateFormatter setDateFormat:@"dd-MM-yyyy"];
NSDate *dateFromString = [[NSDate alloc] init];
// voila!
dateFromString = [dateFormatter dateFromString:dateString];
Nslog(@"%@",[dateFormatter dateFromString:dateString]);
Warning: date(): Invalid date.timezone value 'Europe/Kyiv', we selected the timezone 'UTC' for now. in /var/www/agent_stack/data/www/ajaxhispano.com/template/agent.layouts/content.php on line 61
2014-07-25 07:13:57
Use este método para convertir de NSString
a NSdate
:
-(NSDate *)getDateFromString:(NSString *)pstrDate
{
NSDateFormatter* myFormatter = [[NSDateFormatter alloc] init];
[myFormatter setDateFormat:@"dd/MM/yyyy"];
NSDate* myDate = [myFormatter dateFromString:pstrDate];
return myDate;
}
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2014-07-25 07:22:25
Si alguien está interesado en hacer algo como esto en Swift en estos días, tengo un comienzo en algo, aunque no es perfecto.
func detectDate(dateString: NSString) -> NSDate {
var error: NSError?
let detector: NSDataDetector = NSDataDetector.dataDetectorWithTypes(NSTextCheckingType.Date.toRaw(), error: &error)!
if error == nil {
var matches = detector.matchesInString(dateString, options: nil, range: NSMakeRange(0, dateString.length))
let currentLocale = NSLocale.currentLocale()
for match in matches {
match.resultType == NSTextCheckingType.Date
NSLog("Date: \(match.date.description)")
return match.date
}
}
return NSDate()
}
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2014-08-22 02:53:01
Fecha de NSString
NSString *dateString = [NSString stringWithFormat:@"%@",[NSDate date]];
NSLog(@"string: %@",dateString ); //2015-03-24 12:28:49 +0000
NSString a NSDate
NSDateFormatter *formatter = [[NSDateFormatter alloc] init];
[formatter setDateFormat:@"yyyy-MM-dd HH:mm:ss Z"];
NSDate *date = [formatter dateFromString:dateString];
NSLog(@"date: %@", date); //015-03-24 12:28:49 +0000
Warning: date(): Invalid date.timezone value 'Europe/Kyiv', we selected the timezone 'UTC' for now. in /var/www/agent_stack/data/www/ajaxhispano.com/template/agent.layouts/content.php on line 61
2015-03-24 12:34:05
Puede usar extensiones para esto.
extension NSDate {
//NSString to NSDate
convenience
init(dateString:String) {
let nsDateFormatter = NSDateFormatter()
nsDateFormatter.dateFormat = "yyyy-MM-dd hh:mm:ss"
// Add the locale if required here
let dateObj = nsDateFormatter.dateFromString(dateString)
self.init(timeInterval:0, sinceDate:dateObj!)
}
//NSDate to time string
func getTime() -> String {
let timeFormatter = NSDateFormatter()
timeFormatter.dateFormat = "hh:mm"
//Can also set the default styles for date or time using .timeStyle or .dateStyle
return timeFormatter.stringFromDate(self)
}
//NSDate to date string
func getDate() -> String {
let dateFormatter = NSDateFormatter()
dateFormatter.dateFormat = "dd, MMM"
return dateFormatter.stringFromDate(self)
}
//NSDate to String
func getString() -> String {
let dateFormatter = NSDateFormatter()
dateFormatter.dateFormat = "yyyy-MM-dd hh:mm:ss"
return dateFormatter.stringFromDate(self)
}
}
Así que mientras que el código de ejecución real se verá como sigue
var dateObjFromString = NSDate(dateString: cutDateTime)
var dateString = dateObjFromString.getDate()
var timeString = dateObjFromString.getTime()
var stringFromDate = dateObjFromString.getString()
También hay algunos métodos predeterminados, pero supongo que podría no funcionar para el formato que ha dado de la documentación
-dateFromString(_:)
-stringFromDate(_:)
-localizedStringFromDate(_ date: NSDate,
dateStyle dateStyle: NSDateFormatterStyle,
timeStyle timeStyle: NSDateFormatterStyle) -> String
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2014-11-10 12:27:13
La mejor práctica es construirse una clase general donde ponga todos sus métodos de uso general, métodos útiles en casi todos los proyectos y allí agregue el código sugerido por @ Pavan como:
+ (NSDate *)getDateOutOfString:(NSString *)passedString andDateFormat:(NSString *)dateFormat{
NSString *dateString = passedString;
NSDateFormatter *dateFormatter = [[NSDateFormatter alloc] init];
[dateFormatter setDateFormat:dateFormat];
NSDate *dateFromString = [[NSDate alloc] init];
dateFromString = [dateFormatter dateFromString:dateString];
return dateFromString;
}
.. y así sucesivamente para todos los demás métodos útiles
Al hacerlo, comienza a construir un código reutilizable limpio para su aplicación. ¡Salud!
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2016-02-04 20:54:44
Según Swift 2.2
Puede obtener fácilmente NSDate de String y String de NSDate. por ejemplo,
Primer formateador de fecha establecido
let formatter = NSDateFormatter();
formatter.dateStyle = NSDateFormatterStyle.MediumStyle
formatter.timeStyle = .NoStyle
formatter.dateFormat = "MM/dd/yyyy"
Ahora obtiene la fecha de la cadena y viceversa.
let strDate = formatter.stringFromDate(NSDate())
print(strDate)
let dateFromStr = formatter.dateFromString(strDate)
print(dateFromStr)
Ahora disfruta.
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2016-04-26 13:44:22
NSString a NSDate o NSDate a NSString
//This method is used to get NSDate from string
//Pass the date formate ex-"dd-MM-yyyy hh:mm a"
+ (NSDate*)getDateFromString:(NSString *)dateString withFormate:(NSString *)formate {
// Converted date from date string
NSDateFormatter *dateFormatter = [[NSDateFormatter alloc] init];
[dateFormatter setLocale:[[NSLocale alloc] initWithLocaleIdentifier:@"en_US"]];
[dateFormatter setDateFormat:formate];
NSDate *convertedDate = [dateFormatter dateFromString:dateString];
return convertedDate;
}
//This method is used to get the NSString for NSDate
//Pass the date formate ex-"dd-MM-yyyy hh:mm a"
+ (NSString *)getDateStringFromDate:(NSDate *)date withFormate:(NSString *)formate {
// Converted date from date string
NSDateFormatter *dateFormatter = [[NSDateFormatter alloc] init];
//[dateFormatter setLocale:[[NSLocale alloc] initWithLocaleIdentifier:@"en_US"]];
[dateFormatter setDateFormat:formate];
NSString *convertedDate = [dateFormatter stringFromDate:date];
return convertedDate;
}
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2017-03-08 07:56:39
Los ejemplos anteriores no están escritos simplemente para Swift 3.0 +
Update-Swift 3.0 + - Convertir Fecha A Cadena
let date = Date() // insert your date data here
var dateFormatter = DateFormatter()
dateFormatter.dateFormat = "yyyy-MM-dd" // add custom format if you'd like
var dateString = dateFormatter.string(from: date)
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2017-04-05 19:22:42
Cadena Hasta La Fecha
var dateFormatter = DateFormatter()
dateFormatter.format = "dd/MM/yyyy"
var dateFromString: Date? = dateFormatter.date(from: dateString) //pass string here
Fecha A Cadena
var dateFormatter = DateFormatter()
dateFormatter.dateFormat = "dd-MM-yyyy"
let newDate = dateFormatter.string(from: date) //pass Date here
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2018-04-16 05:25:18