- Date functions: 

  + get min / max date in the input list

  + get position of min / max date in the input list

- Date time functions: 

  + get millisecond difference by 2 input date times

  + get UTC date time by input date time

- Day functions: 

  + get weekend day difference between 2 input dates

  + get working day difference between 2 input dates

- Month functions: 

  + get first day of month by input date / week number

  + get last day of month by input date / week number

- Week functions: 

  + get week difference between 2 input dates

  + get day of week by input date

  + get Sunday, Monday, Tuesday, Wednesday, Thursday, Friday, Saturday by the input date / week number

  + week number by input date