Daylight Saving Time is the cause.
GMT is always the same, no matter what the month. So you normally are in GMT -8, but in the summer your time is GMT -7.
__________________
With our extreme gelatinous apology,
We beg to inform your Imperial Majesty,
Unto whom be dominion and power and glory,
There still remains that strange precipitate
Which has the quality to resist
Our oldest and most trusted catalyst.
It is a substance we cannot cremate
By temperatures known to our Laboratory.
~ E.J. Pratt
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