Date in GMT timezone
: day of month from 1 to 31
an instance of the corresponding day of week
: day of year from 1 to 366
: hours from 0 to 23
: minutes from 0 to 59
an instance of the corresponding month
: seconds from 0 to 60(last is for leap second)
is a number of epoch milliseconds
: year in common era(CE: https://en.wikipedia.org/wiki/Common_Era)
Subtracts the specified number of milliseconds
Subtracts the specified duration
Adds the specified number of milliseconds
Adds the specified duration
Convert to Date
Truncate to seconds by discarding sub-second part