Ruby-on-rails 在特定时区的一天开始时获取时间对象
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Get Time Object at Start of Day in a Particular Time Zone
提问by Blake Taylor
How can I get a ruby Time object that represents the start of the day on a particular date in a given timezone.
如何获得代表给定时区中特定日期的一天开始的 ruby Time 对象。
采纳答案by Blake Taylor
I ended up using the #localmethod on the ActiveSupport::TimeZoneobject passing components of the Dateobject.
我最终#local在ActiveSupport::TimeZone传递对象组件的Date对象上使用了该方法。
# Get example date and time zone...
date = Date.today
timezone = ActiveSupport::TimeZone['America/New_York']
# Get beginning of day for date in timezone
timezone.local(date.year, date.month, date.day)
回答by Timothy Hunkele
date = Date.today
date.to_time.in_time_zone('America/New_York').beginning_of_day
Currently outputs => 2011-11-02 00:00:00 -0400
当前输出 => 2011-11-02 00:00:00 -0400
Time.now.in_time_zone('Asia/Shanghai').beginning_of_day
Currently outputs => 2011-11-03 00:00:00 +0800
当前输出 => 2011-11-03 00:00:00 +0800
date = Date.today
date.to_time.in_time_zone('Asia/Shanghai').beginning_of_day
Currently outputs => 2011-11-02 00:00:00 +0800
当前输出 => 2011-11-02 00:00:00 +0800
回答by David J.
Not sure if this helps, but this gets me the time at which my Google API quotas reset:
不确定这是否有帮助，但这让我知道我的 Google API 配额重置的时间：
# The most recent midnight in California in UTC time
def last_california_midnight
(Time.now.utc - 7.hours).midnight + 7.hours
end
I use it like this with Mongoid, for example:
我像这样在 Mongoid 中使用它，例如：
def api_calls_today
Call.where(updated_at: { '$gte' => last_california_midnight }).count
end
This will work no matter what timezone the code is deployed to, as long Mongo is set to UTC.
无论代码部署到哪个时区，只要 Mongo 设置为 UTC，这都将起作用。
