ShowAll Questionssorted byDate Posted
Narendra Reddy Gopavaram

# How to calculate number of sunday's in a given month and year?

Hi All,

Can any one help me to calculate number of sunday's in a given month and year using apex and vf page.

Ex: If i select March 2017 from vf page, i need to calculate number of sunday's from selected month and year.

Best Answer chosen by Narendra Reddy Gopavaram
Andrew G
Investigate the dayOfWeek method

```Integer month = 10;
Integer year = 2019;
Integer numberDays = Date.daysInMonth(year, month);
Integer noOfSun = 0;

for(Integer i=1;i<=numberDays ;i++)
{
Date myDate = date.newInstance(year, month, i);
Datetime dt = (DateTime)myDate;
if(dt.format('EEEE' == 'Sunday')
{
noOfSun = noOfSun + 1;
}
}```

Save the computations related to start date and modulos.

Regards
Andrew

Maharajan C
Hi narendra,

Integer month = 10;
Integer year = 2019;

Integer numberDays = Date.daysInMonth(year, month);
Date startDate = date.newInstance(2001, 1, 1);
List<String> listDay = new List<String>{'Monday' , 'Tuesday' , 'Wednesday' , 'Thursday' , 'Friday','Saturday' , 'Sunday' };

system.debug( ' ==> ' + numberDays );
Integer noOfSun = 0;
for(Integer i=1;i<=numberDays ;i++)
{
Date myDate = date.newInstance(year, month, i);
Integer remainder = Math.mod(startDate.daysBetween(myDate) , 7);
String dayValue = listDay.get(remainder);
if(dayValue == 'Sunday')
{
noOfSun = noOfSun + 1;
}
}

system.debug(  ' @@@ noOfSun =>  ' + noOfSun );

Thanks,
Maharajan.C
Andrew G
Investigate the dayOfWeek method

```Integer month = 10;
Integer year = 2019;
Integer numberDays = Date.daysInMonth(year, month);
Integer noOfSun = 0;

for(Integer i=1;i<=numberDays ;i++)
{
Date myDate = date.newInstance(year, month, i);
Datetime dt = (DateTime)myDate;
if(dt.format('EEEE' == 'Sunday')
{
noOfSun = noOfSun + 1;
}
}```

Save the computations related to start date and modulos.

Regards
Andrew
This was selected as the best answer
david deo
I need to be able to count the number of Sundays, Mondays, Tuesdays, etc. between the start and ... 3 points · 2 years ago · edited 2 years ago.
\$total_days=cal_days_in_month(CAL_GREGORIAN, \$month, \$year); for(\$i=1 ... return \$sundays; ... any other day in a month then set the \$day accordingly.
Write a program that gets the number (Day date) of the day in that month and prints ... Returns: 0=Sunday, 1=Monday, etc unsigned day_of_week( unsigned year, ... We won't concern ourselves with days of any other month. 2.
https://customersurveyinfo.com