Template:DST start date/US/doc

Gives the start date for daylight saving time in the United States (currently the second Sunday in March) for the year in parameter 1 (the current year if not specified), which must be 1967 or later.

Optional parameter 2 (named disp), when set to " md ", causes output of month and day only (e.g. "November 3"). If not present, or set to " mdy " (or any other value), output includes month, day, and year (e.g. "November 3, 2013").

The dates for 1967–2012 are historically correct, and those for 2013 and beyond are accurate.