问题
I need to convert a string to date in a specific timezone.
Eg.
from = "June 13, 2015"
Date.strptime(from,"%b %d, %Y") #=> Sat, 13 Jun 2015
Date.strptime(from.strip,"%b %d, %Y").in_time_zone("America/Chicago") #=> Sat, 13 Jun 2015 00:00:00 CDT -05:00 which is ActiveSupport::TimeWithZone format
Date.strptime(from,"%b %d, %Y").in_time_zone("America/Chicago").to_date #=>Sat, 13 Jun 2015 which is in UTC Date class
I need the final date in America/Chicago timezone. How can I achieve that?
I need to achieve a date in the desired timezone and not time in a desired timezone.
Time.now.in_time_zone("Eastern Time (US & Canada)") will give ActiveSupport::TimeWithZone format while I need the date format in desired timezone.
回答1:
Use DateTime:
from = "June 13, 2015"
DateTime.strptime(from,"%b %d, %Y").in_time_zone("America/Chicago")
=> Fri, 12 Jun 2015 19:00:00 CDT -05:00
Notice it is showing a time of 19:00. That's because a time is not specified so it thinks you are referring to 00:00 UTC, which is 19:00 CDT
One way to achieve what you are trying to do is:
Date.strptime(from.strip,"%b %d, %Y").in_time_zone("America/Chicago").to_datetime
=> Sat, 13 Jun 2015 00:00:00 -0500
This gives you a DateTime object at midnight on that date. You can then add time to get to a certain time of that day if you want.
my_date = Date.strptime(from.strip,"%b %d, %Y").in_time_zone("America/Chicago").to_datetime
=> Sat, 13 Jun 2015 00:00:00 -0500
my_date.in_time_zone("UTC")
=> Sat, 13 Jun 2015 05:00:00 UTC +00:00
my_date + 8.hours
=> Sat, 13 Jun 2015 08:00:00 -0500
来源：https://stackoverflow.com/questions/34175813/convert-string-to-date-of-specific-timezone