Do you know someone who's just turned 31? Well it's their lucky year! After consulting with the office mathematician (calculator), we discovered that 31.69 years is also 1 billion seconds – which means there's another reason to celebrate!
Simply tap in their birthdate and time of birth (if you know it) below to find out precisely when you should be cracking open that bubbly.
Need to know
Size: A6 (105 x 148mm / 4.1 x 5.8in – fits as standard sized letter in UK post)
Inside: Message inside left page (see photos). Blank on the inside right page for your own message
Envelope: Plain white gummed with diamond flap
Additional info: Printed in the UK on recycled card
The patch is also available to buy individually.
When will you have lived for 1 billion seconds?
Enter the date and approximate time that you (or a friend) were born and press Submit to find out!