I want to set up timeZone boolean like if mobile timeZone is America/New_Yor boolean is true.
it have to check multiple .contains America/New_York OR America/Chicago OR America/Denver OR America/Los_Angeles OR America/Anchorage OR America/Adak
TimeZone tz = TimeZone.getDefault();
boolean isContains = tz.getID().contains();
java.time
Use java.time, the modern Java date and time API, for your time work.
List<ZoneId> relevantUsTimeZones = Arrays.asList(
ZoneId.of("America/New_York"),
ZoneId.of("America/Chicago"),
ZoneId.of("America/Denver"),
ZoneId.of("America/Los_Angeles"),
ZoneId.of("America/Anchorage"),
ZoneId.of("America/Adak"));
boolean isContains = relevantUsTimeZones.contains(ZoneId.systemDefault());
System.out.println(isContains);
Output when I ran in Europe/Copenhagen time zone:
false
And in America/Anchorage time zone:
true
Link: Oracle tutorial: Date Time explaining how to use java.time.
Related
For example my local time_zone is Canada and i am getting date in Chennai timezone. How can I convert the Chennai timezone to UTC?
Using server time
You can call ActiveSupport::TimeWithZone#utc on the result.
Example:
Time.zone.now.utc
Keep in mind that .now is using the server time zone when config.time_zone is set.
When you receive a time
If you are getting the datetime in Chennai timezone it will probably look like this: 2019-11-26T12:20:00.655+05:30
To convert it in different time zone, use:
time = Time.parse("2019-11-26T12:20:00.655+05:30")
pacific_time = time.in_time_zone("Pacific Time (US & Canada)")
# and then UTC if you want
pacific_time.utc
let timeZone = NSTimeZone.system.description
let localTimeZone = TimeZone.ReferenceType.local.description
let currentTimeZone = TimeZone.current.description
let defaultTimeZone = TimeZone.ReferenceType.default.description
let autoUpdateTimezon = TimeZone.autoupdatingCurrent.description
print ("System Timezone \(timeZone)")
print ("Local Timezone \(localTimeZone)")
print ("Current Timezone \(currentTimeZone)")
print ("Default Timezone \(defaultTimeZone)")
print ("Auto updating Timezone \(autoUpdateTimezon)")
OUTPUT
System Timezone Asia/Kolkata (current)
Local Timezone Asia/Kolkata (autoupdatingCurrent)
Current Timezone Asia/Kolkata (current)
Default Timezone Asia/Kolkata (current)
Auto updating Timezone Asia/Kolkata (autoupdatingCurrent)
So, i get all the output are same so whats the difference among these timezone and which timezone we should use in which case.
Problem
I used following to code for the date conversion
static func stringToString(strDate:String, fromFormat:String, toFormat:String)->String{
let dateFormatter = DateFormatter()
dateFormatter.timeZone = TimeZone.init(abbreviation: "UTC") ?? TimeZone(identifier: "UTC") ?? TimeZone.ReferenceType.default
dateFormatter.dateFormat = fromFormat
let currentDate = dateFormatter.date(from: strDate) ?? Date()
dateFormatter.dateFormat = toFormat
dateFormatter.timeZone = TimeZone.ReferenceType.default
let currentDates = dateFormatter.string(from: currentDate)
return currentDates
}
Scene : My app is crashing in qatar if user set timezone automatically and off the 24 hours, but in india there is no crash
(TimeZone.ReferenceType.local)
I have given next build with TimeZone.ReferenceType.default and issue is solved
So, i cant understand what was the issue.
Crash Report
Old Code in which i am getting crash
Note that TimeZone.ReferenceType is basically NSTimeZone.
If you look at the docs for TimeZone and NSTimeZone you'll find out very quickly.
From the NSTimeZone:
The system class property returns the time zone currently used by the system, if known. This value is cached once the property is accessed and doesn't reflect any system time zone changes until you call the resetSystemTimeZone() method. The local class property returns an autoupdating proxy object that always returns the current time zone used by the system.
To summarise, system is cached so won't change when the user changes their time zone. You have to call resetSystemTimeZone to update it. local on the other hand automatically updates when the user changes their time zone.
The same thing is true for TimeZone:
TimeZone provides two static functions to get time zone values: current and autoupdatingCurrent. The autoupdatingCurrent time zone automatically tracks updates made by the user.
current corresponds to system and autoupdatingCurrent corresponds to local.
Local -> An object that tracks the current system time zone. Use this property when you want an object that always reflects the current system time zone. from ios 11, the local class property reflects the current system time zone, whereas previously it reflected the default time zone.
System -> The time zone currently used by the system. If you access the system class property, its value is cached by the app and doesn't update if the user subsequently changes the system time zone. In order for the system property to reflect the new time zone, you must first call the resetSystemTimeZone() method to clear the cached value.
Default -> The default time zone for the current app.If no default time zone has been set, the current system time zone is used. If the current system time zone cannot be determined, the GMT time zone is used instead.The default time zone is used by the app for date and time operations. You can set it to cause the app to run as if it were in a different time zone.
Current -> The time zone currently used by the system.
autoupdatingCurrent -> The time zone currently used by the system, automatically updating to the user’s current preference.
Source -> https://developer.apple.com/documentation/foundation/nstimezone
I have this date in actuall
2016-09-03 19:00:00 +0000
Now I am trying to convert it to String using a specific format like below
But what I am getting in return is not as desired. the formatter is adding on day to the given date like below
Is this standard behaviour ?
This is not standard behaviour. This happen because of the time zone difference. Set time zone proper
Set the timezone.
formatter.timeZone = [NSTimeZone timeZoneWithAbbreviation: #"GMT"];
When you hover over the date, you can see that it is showing UTC, whereas the formatter is automatically converting this to a local date. If your timezone is 5 hours ahead of UTC, then it will be the next day locally from that time.
I want to store the date and time in mysql2 database,the time which I want to store is in GMT zone, but after saving the time is getting converted in other zone,
Can any one tell how to change the mysql2 timezone.
You need to set global time zone in mysql. Use following link command to set it to gmt:
SET GLOBAL time_zone = timezone;
If the issue is specific to Rails, set the default time zone in your configuration:
Application.rb
config.time_zone = 'Eastern Time (US & Canada)'
A number of ways:
start the server with the '--timzeone' paramter, in this case, it would be --timezone=UTC.
You can set the TZ environment variable.
Start the server with the --default-global-timezone paramter, set to UTC.
At the start of every connection, issue a SET time_zone = GMT.
I am trying to get the time of other GMT value by using
Calendar c1 = Calendar.getInstance(TimeZone.getTimeZone(gmt));
but how can i get the DST time at that time zone.
The TimeZone class provides a getDSTSavings() method for a specific TimeZone Object. (JavaDoc: "Returns the amount of time to be added to local standard time to get local wall clock time.")
The Calendar interface provides two getOffset() methods, which let you find out the offset from UTC. (JavaDoc: "Returns the offset of this time zone from UTC at the specified date. If Daylight Saving Time is in effect at the specified date, the offset value is adjusted with the amount of daylight saving. ")
please see this piece of code to grok the complicated ways of java time:
#Test
public void testDST() {
final TimeZone met = TimeZone.getTimeZone("MET");
Calendar gc = new GregorianCalendar(met);
final long timeInMillis = gc.getTimeInMillis();
final long gmtTime= timeInMillis-(gc.getTimeZone().getOffset(timeInMillis));
final Date gmtDate = new Date(gmtTime);
System.out.printf("%-40s: %tc\n%-40s: %tc\n%-40s: %tc\n%-40s: %d\n%-40s: %d",
"new Date() (local timezone)",new Date(),
"UTC", gmtDate ,
"now from Calendar with TC GMT+02:00",gc,
"zoneoffset",gc.get(Calendar.ZONE_OFFSET),
"dst savings",met.getDSTSavings());
}
You can also define your own SimpleTimeZone and provide custom DST rules, however, i have not found out how to get this information from the predefined TimeZones.
You should also be aware, that if TimeZone.getTimeZone(TZName) does not find the specified timezone, it does not throw an exception, but it just uses GMT, which can cause major misunderstandings.
You can find all this information (and a lot more) in javadoc for Calendar, TimeZone, Date, etc.
There are few methods available in java.util.TimeZone to get Daylight Saving Time. Please check out the BlackBerry Java Docs page.