When was Thanos first Snap?

In the comic books published by Marvel Comics, the event on which the initial part of the Blip is based occurred during the 1991 The Infinity Gauntlet series, and came to be called the Snap. While still carried out by Thanos, it was done in an effort to impress the personification of Death, with whom he was enamored.

At what time did Thanos snap his fingers?

The time of day in Wakanda when Thanos snapped his fingers is unknown.

What day does the snap happen?

Under the new SNAP issuance schedule, benefits will be distributed on the 1st through 23rd of each month. DCFS will take three months to transition to the new schedule, beginning in December 2020. Recipients classified as elderly or disabled will continue to receive their benefits on the 1st through 4th of each month.