UTC date
2029-05-16
💡 Holiday countdown
A May 16 UTC countdown for light science, photonics, education, art, energy, and research calendars.
Countdown
Target: May 16, 2029, 00:00:00
Local target
May 16, 2029, 00:00:00
UTC target
16/05/2029 00:00:00 UTC
Unix seconds
1873584000
Unix milliseconds
1873584000000
International Day of Light 2029 is counted down to Wednesday, May 16, 2029 at 12:00 AM UTC. The canonical URL keeps the year in the path, so International Day of Light 2029 and International Day of Light 2030 are separate target-date pages.
2029-05-16
Fixed calendar date: May 16.
Share this fixed holiday page when the date is public; use the custom countdown for private launches and deadlines.