Question

I want to create an Datetime object based on the number of day in the year.
This number is from the 365 days of the year (for example it can be: 123 or 23 or 344…)

How can I do that?

Thanks

Answer 1

Use the DateTime.ordinal method. Here’s an example to get the 100th day of year 2011.

require 'date'
year, day = 2011, 100
DateTime.ordinal(year, day)
# #<DateTime: 2011-04-10T00:00:00+00:00 (4911323/2,0,2299161)>