List of functions for working with date when specifying constraints, the example applied to your code

Function name	return Type	argument Types	note
TODAY	date/Time	no parameters	Returns the current date along with time
Telcodata	Date/Time	:Date/Time
Tolkoviy	Date/Time	:Date/Time
Day of the week	:Number	date/Time	1 = Monday, 2 = Tuesday, etc.
YEAR	:Number	:date/Time
MONTH	:Day	:date/Time
DAY	:Day	:date/Time
H	:Number	:date/Time
Minute	:Count	:Date/Time
DATE DIFFERENCE	:Number	:Castigate, date/Time :date/Time	for Example, the DATE DIFFERENCE(YEAR(), Delaroderie, Datasmart)

Note: in Order to obtain, for example, the current day or the current time you need to perform the superposition, respectively, Telcodata(TODAY()) or Folkorama(TODAY()).

Example: to bring those who have birthday today

var langDef = new ExternalLangDef();
Function function = langDef.GetFunction(langDef.funcEQ,
                                        langDef.GetFunction(langDef.funcOnlyDate,
                                                            new VariableDef(langDef.DateTimeType, "Dataromance")),
                                        langDef.GetFunction(langDef.funcOnlyDate,
                                                            langDef.GetFunction("TODAY")));

Example: to bring those who died at 01:00:00

var langDef = new ExternalLangDef();
Function function = langDef.GetFunction(langDef.funcEQ,
                                        langDef.GetFunction(langDef.funcOnlyTime,
                                                            new VariableDef(langDef.DateTimeType, "Datasmart")),
                                        langDef.GetFunction(langDef.funcOnlyTime,
                                                            DateTime.Parse("01:00:00")));