jodatime how to know if daylight savings is on

Question

I have an API that needs the timezone. For eg. if I am in california, I need to pass -7 to it when daylight savings is on (California , PDT is GMT - 7) and -8 to it when day

Answer 1

When you create a DateTime with JodaTime, you don't need to pass an offset. Instead, pass the time zone. It will take care of determining the correct offset, including consideration for DST.

// First get a DateTimeZone using the zone name
DateTimeZone zone = DateTimeZone.forID("America/Los_Angeles");

// Then get the current time in that zone.
DateTime dt = new DateTime(zone);

// Or if you prefer to be more explicit, this syntax is equivalent.
DateTime dt = DateTime.now(zone);

UPDATE

I'm still not sure exactly what you are asking, but perhaps you are looking for one of these:

// To get the current Pacific Time offset
DateTimeZone zone = DateTimeZone.forID("America/Los_Angeles");
int currentOffsetMilliseconds = zone.getOffset(Instant.now());
int currentOffsetHours = currentOffsetMilliseconds / (60 * 60 * 1000);


// To just determine if it is currently DST in Pacific Time or not.
DateTimeZone zone = DateTimeZone.forID("America/Los_Angeles");
boolean isStandardOffset = zone.isStandardOffset(Instant.now());
boolean isDaylightOffset = !isStandardOffset;