Returns the "first day of month" adjuster, which returns a new date set to
the first day of the current month.
!(p)
The ISO calendar system behaves as follows:!(br)
The input 2011-01-15 will return 2011-01-01.!(br)
The input 2011-02-15 will return 2011-02-01.
!(p)
The behavior is suitable for use with most calendar systems.
It is equivalent to:
!(pre)
temporal._with(DAY_OF_MONTH, 1);
</pre>
Returns the "first day of month" adjuster, which returns a new date set to the first day of the current month. !(p) The ISO calendar system behaves as follows:!(br) The input 2011-01-15 will return 2011-01-01.!(br) The input 2011-02-15 will return 2011-02-01. !(p) The behavior is suitable for use with most calendar systems. It is equivalent to: !(pre) temporal._with(DAY_OF_MONTH, 1); </pre>
@return the first day-of-month adjuster, not null