The earlier date
Optionaloptions: DifferenceInDaysOptionsAn object with options
The number of full days according to the local timezone
Get the number of full day periods between two dates. Fractional days are truncated towards zero.
One "full day" is the distance between a local time in one day to the same local time on the next or previous day. A full day can sometimes be less than or more than 24 hours if a daylight savings change happens between two dates.
To ignore DST and only measure exact 24-hour periods, use this instead:
Math.trunc(differenceInHours(dateLeft, dateRight)/24)|0.
// How many full days are between
// 2 July 2011 23:00:00 and 2 July 2012 00:00:00?
const result = differenceInDays(
new Date(2012, 6, 2, 0, 0),
new Date(2011, 6, 2, 23, 0)
)
//=> 365
// How many full days are between
// 2 July 2011 23:59:00 and 3 July 2011 00:01:00?
const result = differenceInDays(
new Date(2011, 6, 3, 0, 1),
new Date(2011, 6, 2, 23, 59)
)
//=> 0
// How many full days are between
// 1 March 2020 0:00 and 1 June 2020 0:00 ?
// Note: because local time is used, the
// result will always be 92 days, even in
// time zones where DST starts and the
// period has only 92*24-1 hours.
const result = differenceInDays(
new Date(2020, 5, 1),
new Date(2020, 2, 1)
)
//=> 92
The later date