Allow users to add their friends or families birthdays

Play music in the background of a countdown

July 4th

Presidential Inauguration 2020

how many days till your period

Mobile World Congress; 27 Feb-2 March, Barcelona
https://www.mobileworldcongress.com/

Release dates for Video games (Console, PS2, PS3, PS4, XBox, Nintendo, 3DS, Wii, Xbox One, Xbox 360, PC, Mac, Steam, Vita)

A secular festival observed by many African Americans from 26 December to 1 January as a celebration of their cultural heritage and traditional values.

There's a women's day and she getting loads of flowers that day is very important day

It's cool being able to countdown to when a day starts, but as far as I'm aware there's no way to countdown to an exact time during a day, like 3:30pm on 7th of December as a random example.

For Google Android

This is a beautiful count down website. Is there a way to embed one of these count-downs into my website?

Instead of having just days to have a tab for today's date

var today = new Date();
var dd = today.getDate();
var mm = today.getMonth()+1; //January is 0!
var yyyy = today.getFullYear();

if(dd<10) {
dd='0'+dd
}

if(mm<10) {
mm='0'+mm
}

today = mm+'/'+dd+'/'+yyyy;
document.write(today);

Allow users to track the number of days since a relationship started with (when they met or started going out with) a friend, girlfriend, boyfriend, fiance, husband, wife etc.