Very good Reminder.

The sages decreed that the search for chametz should take place on the night of the fourteenth of Nissan (March 30/18) . This time was chosen because people are usually at home in the evening, and because one cannot search effectively in the corners by daylight. It is necessary to use a candle for this, and since candlelight has little effect during the day, it was decreed that the search be done in the evening.

The correct time for the search is when the stars appear.

Although it is common practice to perform a mitzvah at the earliest possible time, this mitzvah should not be performed before the appearance of the stars. The search should be started immediately when the stars appear, while there is still a bit of daylight.

From half an hour before the stars appear, at the time when the sun sets on the thirteenth of Nissan, one should be careful not to begin any work, nor should one eat, until after he has searched for the chametz. Even if one usually engages in Torah study at this time, he should postpone it until after the search. If one began to study or to work at a time while it is still permissible, he should interrupt whatever he is doing as soon as the time for the search arrives.

Passover 2018 will be celebrated from March 30- April 7.
The first Seder will be on March 30 after nightfall, and the second Seder will be on March 31 after nightfall.

Passover is celebrated by eating matzah (unleaven bread) and maror (bitter herbs). For the duration of the 8 (or 7 days in Israel) of Passover, chametz (leaven) is strictly avoided.

What Is Passover?

The eight-day festival of Passover is celebrated in the early spring, from the 15th through the 22nd of the Hebrew month of Nissan, March 30-April 7, 2018. Passover (Pesach) commemorates the emancipation of the Israelites from slavery in ancient Egypt. Pesach is observed by avoiding leaven, and highlighted by the Seder meals that include four cups of wine, eating matzah and bitter herbs, and retelling the story of the Exodus.

In Hebrew it is known as Pesach (which means “to pass over”), because G‑d passed over the Jewish homes when killing the Egyptian firstborn on the very first Passover eve.