According to the season 1 finale, where Jenna Kaye was looking at info on Steve, and according to confirming Tweets by HF-0 producer Peter Lenkov, March 10th (1977) is Steve's birthday.

I issued a 'Steve's Birthday Challenge' over at the Hawaii Five-0 ProBoards, and am extending that here as well... so, write a story. It can be a surprise party, or not. Hosted, or not. Or maybe about what else Steve might do on his birthday (other than a party), either alone or with others. Please have it posted by March 10th. Or if it's a multi-chapter, at least the first chapter by March 10th.

For the case of my story, Steve hasn't had a real party since his 15th birthday, which was just before his mother died. And as an adult, well, the past 8 years anyway, he has spent his birthdays with Catherine.

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"MARCH 10th" chapter 1

March 10th, 8:30am...

'He just left for work. Doesn't suspect a thing.' Was the text message Lieutenant Catherine Rollins sent. She wasn't used to lieing to her boyfriend Lieutenant Commander Steve McGarrett, but she had gone to a lot of trouble to keep this a secret and she just couldn't risk his finding out about it now.

She put her cell phone down on the kitchen counter as she began her project for the day, but her mind kept thinking back to the lie she had told him last night. And again this morning. Okay, technically it was one lie, she'd just had to say it twice. And it was a little white lie. The kind that don't really count. Damn, now she was lieing to herself, too.

The previous evening, March 9th, 8:30pm...

"Danny was right. That was a nice restaurant." She'd said to him last night as they returned to his house.

"I'll be sure to re-phrase that when I tell him, so as not to include the part about him being right." He had replied in a teasing tone.

"I just wish we could have had this dinner tomorrow night." She commented.

"Tonight, tomorrow night, I'm just surprised we made it to dinner this time." He said, wrapping an arm around her waist.

"I just wish I didn't have to leave early." She complained.

"Orders are orders." He reminded her unnecessarily.

"I know. I just don't like breaking our tradition. I want to be here for your birthday." She said as they headed for the stairs.

Back to morning, March 10th...

Catherine sighed heavily, thinking about their conversation the previous night. They had spent every one of Steve's birthdays together since they both worked in Naval Intelligence. It was a tradition they would keep again this year, but Steve didn't know that. Her lie again this morning saw to that.

"What time do you ship out?" He had asked.

"Not until 1300 hours, but I have to be at Pearl at 1100." She had said.

"Well, I've gotta get going. I've got a meeting with the Governor in less than an hour." He said as he grabbed his phone and keys.

"Since I won't be here tonight, and since I have some time before I have to leave, I'm going to put you a nice birthday dinner in the crock pot for you." She said.

The lie hadn't been hard to come up with, and it would help explain the smell of food coming from Steve's house when he got home tonight, but it still felt wrong to lie to someone you care about.

She put on some music to help rid her mind of those thoughts as she began to prepare a lot of food for tonight's surprise party.

6:25pm...

"I've got beer, Danny. You didn't need to stop for more." Steve said as his partner pulled up in the driveway behind him and exited the Camaro.

"I'm not letting the birthday boy buy the beer for his own birthday drink, Steven." Danny stated as they headed for the front door.

"Whatever you say, Danny." Steve said agreeably as he unlocked his front door and turned off the alarm.

"Hey, you holding out on me, man?" Danny asked.

"What?" Steve countered as he turned on a lamp to light the living room.

"That smell. You've been holding back on your cooking skills, haven't you? What is that, Italian? I know Italian, and that's Italian." Danny ranted.

"Sorry, Danny. Between RMEs and the Navy's mess hall on a 10 minute rotation schedule, I didn't have time to perfect my skills as a chef." Steve said.

"Yeah, yeah, okay, but that doesn't explain the smell of Italian food that is coming from your kitchen." Danny said, heading for said room.

"Catherine said she would put something in the crock pot before she left." Steve informed his partner.

"Ah, a little compensation for her early departure." Danny guessed.

Steve just nodded, grabbed two beers and headed out the back door onto the lanai.

"SURPRISE!"

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Okay, so who thinks surprising an armed Navy SEAL is a good idea?
Chapter 2 posted soon.