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    <p>Figured it out. Special thanks to @MarkLakata for pointing out the differences between PDT and PST. Turns out we can't rely on these to play with dates. In my app, I do know the geographic location of my Property though. For now, it's "Pacific Time (US &amp; Canada)", but later I may have properties from many other locations. I want to schedule cleanings in the future. In the real world, people don't usually reschedule around DST. So if I say I'm doing something at 4:15pm, I mean it whether it's DST or not, and I need my app to behave the same way.</p> <pre><code>property.timezone =&gt; "Pacific Time (US &amp; Canada)" Time.zone = property.timezone =&gt; "Pacific Time (US &amp; Canada)" time = Time.zone.parse("2013-12-08 04:15pm").utc =&gt; 2013-12-09 00:15:00 UTC time = Time.zone.parse("2013-10-08 04:15pm").utc #DST =&gt; 2013-10-08 23:15:00 UTC </code></pre> <p>I store my cleaning_date attribute in a PostgreSQL DateTime field on Heroku. I know the timezone from the property, so I can save it after I parse it from the front end.</p> <pre><code>property.update(:cleaning_time =&gt; time) </code></pre> <p>To get it back from the database, I just do this:</p> <pre><code>def cleaning_date_string self.cleaning_time.in_time_zone("Pacific Time (US &amp; Canada)").strftime("%m/%d/%Y") end def cleaning_time_string self.cleaning_time.in_time_zone("Pacific Time (US &amp; Canada)").strftime("%l:%M%P") end </code></pre> <p>Unfortunately, this is the only way I found to save a precise time in the database and retrieve it the exact same way. This seems to work locally and on Heroku.</p> <p>addition:<br> This seems to be thread safe according to: <a href="https://stackoverflow.com/questions/15451637/setting-time-zone-during-a-request-thread-safe">Setting Time.zone during a request: Thread Safe?</a></p>
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    1. POHow to store daylight savings time adjusted utc time
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    1. POHow to store daylight savings time adjusted utc time
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    1. COYou hit on an important point. You are scheduling *future* times, in which case UTC is not as important as the local time + time zone pair. See also [this answer](http://stackoverflow.com/a/19170823/634824) which touches on these points but was for a Java developer.
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      1. USMatt Johnson
 

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