"Daylight Saving Time (DST) is a period of the year between spring and fall when clocks in most parts of the United States are set one hour ahead of standard time. The beginning and ending dates and times--the second Sunday in March at two o'clock ante meridian and the first Sunday in November at two o'clock ante meridian--are set in statute.1 Congressional interest in the potential benefits and costs of DST has resulted in changes to DST observance since it was first adopted in the United States. Congress may consider whether to make additional changes to DST observance or standard time. Congress may also consider whether additional examination of potential benefits and costs of DST observance would be informative. This report presents a selected history of DST in the United States and includes a summary of potential effects, selected state actions related to DST or standard time, and federal legislation that has been introduced related to DST in the 115th Congress."
CRS Report for Congress, R45208