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It's daylight savings time day (Spring equinox) and we all lost an hour. How
would I casually express that this day is going by too quickly?

Something like:

この日の時間は早すぎています。
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2016-03-13T19:40:24.193
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2016-03-15T23:52:54.030
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question
word-choice usage
How to say "This day is going by too quickly" in Japanese?
We usually say ”日が短い” or "日が経{た}つのが早い"、and add "です" or "ですね" in conversation.
You may also add "この頃{ごろ}は - these days" to before "”日が短い” and "日が経{た}つのが早い."

Though ”日が短い” refers to phisical shortness of the length of a day, and
"日が経{た}つのが早い" rather connotes your feeling of the quick passage of time, both
phrases are often used in the greeting in our conversation.

この日の時間は早すぎています sounds awkward and illogical because a day can't be short only
on a single day around this time of the year.
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2016-03-13T21:36:07.723
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2016-03-15T23:52:54.030
2016-03-15T23:52:54.030
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answer
We commonly say もうこんな時間だ (だ can be replaced with か or omitted) which roughly
translates to "Alas, it's already [unspecified] o'clock!"

It might be a bit strange to say it when you have no means to check the time.

Why not

> もう夕方だ  
>  It's already evening.
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2016-03-15T18:52:59.670
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2016-03-15T18:52:59.670
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answer