UTC date
2026-05-16
💡 Holiday countdown
A May 16 UTC countdown for light science, photonics, education, art, energy, and research calendars.
Countdown
Time reached.
Local target
May 16, 2026, 00:00:00
UTC target
16/05/2026 00:00:00 UTC
Unix seconds
1778889600
Unix milliseconds
1778889600000
International Day of Light 2026 is counted down to Saturday, May 16, 2026 at 12:00 AM UTC. The canonical URL keeps the year in the path, so International Day of Light 2026 and International Day of Light 2027 are separate target-date pages.
2026-05-16
Fixed calendar date: May 16.
Share this fixed holiday page when the date is public; use the custom countdown for private launches and deadlines.