How do I calculate the offset, in hours, of a given timezone from UTC in ruby?

Question

I need to calculate the offset, in hours, of a given timezone from UTC in Ruby. This line of code had been working for me, or so I thought:

offset_in_hours =         


        

Answer 1

Yes, use TZInfo like this:

require 'tzinfo'
tz = TZInfo::Timezone.get('America/Los_Angeles')

To get the current period:

current = tz.current_period

To find out if daylight savings time is active:

current.dst?
#=> true

To get the base offset of the timezone from UTC in seconds:

current.utc_offset
#=> -28800 which is -8 hours; this does NOT include daylight savings

To get the daylight savings offset from standard time:

current.std_offset
#=> 3600 which is 1 hour; this is because right now we're in daylight savings

To get the total offset from UTC:

current.utc_total_offset
#=> -25200 which is -7 hours

The total offset from UTC is equal to utc_offset + std_offset.

This is the offset from the local time where daylight savings is in effect, in seconds.