Evenings are getting warmer and longer, but you can kick back only if you aren’t at the office.

The bad news is your to-do list may dismantle your sunset-watching desires. But fortunately there’s good news. Andy Core has some work-smarter ideas to help you get home at a reasonable hour so that you can enjoy those warm summer nights.

The author of the new book “Change Your Day, Not Your Life: A Realistic Guide to Sustained Motivation, More Productivity, and the Art of Working Well” www.andycore.com, promises to help you become what he calls a “Thriver” — someone who works hard, meets or exceeds expectations, and enjoys high levels of personal and professional success, accompanied by (and this is the best part) lower stress levels.

Here is one of his strategies to help you change the way you approach your day—and get out of the office earlier:

Get big things done before 9:00 a.m. (instead of snoozing, procrastinating, and lurking at the water cooler). Ever notice how your morning sets the tone for your whole day? As Sir Isaac Newton famously said, “Objects in motion tend to stay in motion.” So if an object (you) gets a groggy, frustrating start, you’ll probably feel sluggish and behind the eight-ball all day long. However, if you start your day with positive and productive ideas, actions, thoughts, and feelings, you're likely to gain momentum throughout the day.

Here’s an example of what I’m talking about,” Core recounts. “I know a top salesman named Barry whose daily pattern involves getting up early, exercising, eating breakfast, spending time with family, and accomplishing several meetings or other work activities before 9:00 a.m. By the time his colleagues are settling into the starting blocks, Barry has already blown through several important tasks on his to-do list, and he’s geared to continue that pace for the next several hours.

“The point here isn’t how early Barry’s alarm rings—it’s that he makes the most of the first several hours of his day instead of snoozing and procrastinating, as so many of us do,” Core notes. “The truth is this: What you do first matters. And since the sun will keep rising earlier and earlier for the next few months, this is the perfect time to kick off a new morning routine.”