what year did the USA start converting to daylight savings time?

Question

I thought it was during WW II ,then stopped for a period of years
or was optional

Answer 1

1. The very first year of daylight saving time (DST) was in 1918, but the Standard Time Act, that introduced it, was repealed the following year.

2. DST was reintroduced because of World War II, and lasted from February 1942 until September 1945. However, that DST was year-round, and was called "War Time".

3. DST was finally adopted as a permanent nationwide feature in 1966, when the Uniform Time Act became law. Note that some states had chosen to adopt DST in the intervening years.

4. You can read more about it in the following linked wikipedia article.
http://en.wikipedia.org/wiki/History_of_time_in_the_United_States#History_of_DST_in_the_US

Answer 2

who was president in 1966