What is the best way to communicate to a software development team that they need to work more hours to meet a launch date?

Thank you for the invitation, I am not well versed with Software team management.

Every team member is an opportunity & value to his team in his part . _________ "Respect" is the main rule in any successful work field. __________ The Key of Successful team is the Mix between The respect & the next Core points and it's : _______________ •First: To Know the needs of Every member of your team that will help you to collaborate his modivation to work and the maximum quality that he can achieve . •Secound: Creat a positive work Field to take the maximum limit of there talents •Third: Give Them General and Mainly Trainings ( like communication Skills: for the positive field,etc..) The Give a private suitable training to etch one in his position (then evaluate results before and after the training ) •Forth: Encourage and reward anyone tryies to develop and invent in the work ( but to his inventing make good results is a must ) •Fifth: Collaborate The Results Before and after adding the first four points Then take an action (1st in your own strategy, 2nd with your crew) Sixth: Use your penalty list With the baddest members and be ready with a replacement •Seventh :Thanks for your patience to read my notes and to try to help your work and your team better and ( That is the real Respect to start teaching and developing my Self before I ordering my Team) You are In the Right Way of Success with your Team (Mr/Mrs) Greeting to all of you Rezk

You have to call a meeting and address the team about the due date and tell them about the overtime money that they will receive and write the name's of the members who are willing to work to met the due date.

i ve been Using Scrum for the last 3 years and its very practical when the team is between 3 and 7.

Specially the Daily Standup , the backlog refinement, sprint planing and sprint retrospective 

In this you way you will have the chance to communicate with your team in every occasion  

First of all i will like to appreciate the software development team what ever they have developed. Then i will ask them how we can improve so many things in the software keeping in view the near future requirments. It will motivate them and they definitely will think on the requirements more positively.

The problem here is not the team, it's the management.

How and why was the wrong launch date selected?  Why are the team not already aware of the launch date and it's significance?  What happened to the original plan for meeting the launch date?  What is the new plan?   Why does the team working more hours solve the problem - what other solutions might there be?   How much extra will the team get paid for rescuing the management from their mistakes?   Etc.

You need a plan.  "More hours" is not a plan, it's a cry for help.  Get the whole team involved in making the plan and implementing it.

Most importantly, stop saying and thinking "they".  There is no "they": there is only "us".  If the company goes bust because the deadline wasn't met, the managers lose their jobs too.

Managers should normally work more hours that the team members.

Open Meeting. It is easier to communicate your passion and how you feel to your team via open meetings

Emails

One on One

Use Presentations

Communication via Training

Display Confidence and Seriousness

Use Simple Words

Use Visuals

Thank you. It's not my field, i am looking forward to experts answer.

They should be communicated through email or over phone calls, Phone calls will be more preferable because it is 121 communication. 

Meet the team and appreciate their progress so far. Compliment them for their hardwork. Tell them that as the launch date is fast approaching, you don't want their hardwork to go in vain. Request them to stay overtime which will be fully paid, with additional arrangement of dinner and optional arrangement of transportation if required. Keep the team at ease. Don't command or be negative in your talk. Listen to team if they have some alternate solutions.