26.6 Calendar Arithmetic

returns the number of days in a year.

returns the number of days in month number month of year.

gap> DaysInYear(1998);
365
gap> DaysInMonth(3,1998);
31

converts a number of days, starting 1-Jan-1970 to a list [day,month,year]

returns the number of days from 01-Jan-1970 to the day given by dmy. dmy must be a list of the form [day,month,year].

returns the weekday of a day given by date. date can be a number of days since 1-Jan-1970 or a list [day,month,year].

converts date to a readable string. date can be a number of days since 1-Jan-1970 or a list [day,month,year].

gap> DayDMY([1,1,1970]);DayDMY([2,1,1970]);
0
1
gap> DMYDay(12345);
[ 20, 10, 2003 ]
gap> WeekDay([11,3,1998]);
"Wed"
gap> StringDate([11,3,1998]);
"11-Mar-1998"

converts a number msec of milliseconds into a list [hour,min,sec,milli].

is the reverse of HMSMSec.

converts time (given as a sumber of milliseconds or a list [hour,min,sec,milli]) to a readable string.

gap> HMSMSec(Factorial(10));
[ 1, 0, 28, 800 ]
gap> SecHMSM([1,10,5,13]);
4205013
gap> StringTime([1,10,5,13]);
" 1:10:05.013"

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