Date logic for cashflows

I have 3 dates: Present date:11/14/2018, Start of lease date: 11/8/2014 and End of lease date
and the remaining payments which is 10 payments from Present date.

Present date is always today's date. Start of lease can be anything but I am working on if the start of lease was in the past.

Based on this i have the following cash flow:

enter image description here

Since the lease started on the 8th, the payments will be on 8th of every month.
I have the following code that parses number of days depending on when the start date is.

    function isLeapYear(year) {

        return (((year % 4 === 0) && (year % 100 !== 0)) || (year % 400 === 0));

    }

    function getDaysInMonth(year, month) {

        return [31, (isLeapYear(year) ? 29 : 28), 31, 30, 31, 30, 31, 31, 30, 31, 30, 31][month];

    }

     function getCurrentDay(date) {

        var dateOfToday;

        if(date && date != "")

            dateOfToday = new Date(date);

        else dateOfToday = new Date();



        var dd = ("0" + (dateOfToday.getDate())).slice(-2);

        var mm = ("0" + (dateOfToday.getMonth() + 1)).slice(-2);

        var yyyy = dateOfToday.getFullYear();



        dateOfToday = yyyy + '-' + mm + '-' + dd;

        return dateOfToday;

    }

function PopulateEndDate() {

        var d2;

        var paymentDays;

        var stDate;

        var pDate;

    

        if (document.getElementById("startDate"))

            stDate = document.getElementById("startDate").value;

        if (document.getElementById("presentDate"))

            pDate = document.getElementById("presentDate").value;

            

        var futureSDate =  (pDate < stDate); //future start date

        var pastSDate = (pDate > stDate); //start date was in the past

        var sameDates = (pDate == stDate);

        

        if (stDate && futureSDate)

            d2 = new Date(stDate);

        else if (stDate && sameDates)

            d2 = new Date(stDate);

        else if (stDate && pastSDate)

            d2 = new Date(pDate);

        else

            d2 = new Date(pDate);

            

        var dd = d2.getDate()+1000;

        var mm = d2.getMonth()+1;

        var yyyy = d2.getFullYear();

        var today = (mm+'/'+dd+'/'+yyyy);



     

        paymentDays = document.getElementById("paymentRemaining").value;

            

        if (paymentDays)

        var n = d2.getDate();

        d2.setDate(1);

        d2.setMonth(d2.getMonth() + parseInt(paymentDays));

        d2.setDate(Math.min(n, getDaysInMonth(d2.getFullYear(), d2.getMonth())));

        if (document.getElementById("endDate"))

            document.getElementById("endDate").value = getCurrentDay(d2);

    }

<label>Start of Lease </label> <input  id="startDate"  onchange="PopulateEndDate()" type="date" ><br/><br/>

<label>Present date </label> <input  id="presentDate" onchange="PopulateEndDate()"  type="date" ><br/><br/>

<label>Remaining Payments</label> <input id="paymentRemaining" name = "paymentRemaining" type="number" class="label1" style="text-align: right; width:80px;"> <br/><br/>

<label>End of Lease </label> <input  id="endDate"  onchange="PopulateEndDate()" type="date" ><br/><br/><br/>

The issue here is that I need the end date to be calculated from today's date however end 1 day before the start of lease date. In this case it parses 10 payments and the end date is on 9/13/2019.

But, it should be on 10/8/2019. Any help is appreciated. Thank you.

asked Nov 14 '18 at 19:11

ace23

5811

Using a date library like moment.js would help you simplify the logic for something like this

– charlietfl
Nov 14 '18 at 19:15

add a comment |

I have 3 dates: Present date:11/14/2018, Start of lease date: 11/8/2014 and End of lease date
and the remaining payments which is 10 payments from Present date.

Present date is always today's date. Start of lease can be anything but I am working on if the start of lease was in the past.

Based on this i have the following cash flow:

enter image description here

Since the lease started on the 8th, the payments will be on 8th of every month.
I have the following code that parses number of days depending on when the start date is.

    function isLeapYear(year) {

        return (((year % 4 === 0) && (year % 100 !== 0)) || (year % 400 === 0));

    }

    function getDaysInMonth(year, month) {

        return [31, (isLeapYear(year) ? 29 : 28), 31, 30, 31, 30, 31, 31, 30, 31, 30, 31][month];

    }

     function getCurrentDay(date) {

        var dateOfToday;

        if(date && date != "")

            dateOfToday = new Date(date);

        else dateOfToday = new Date();



        var dd = ("0" + (dateOfToday.getDate())).slice(-2);

        var mm = ("0" + (dateOfToday.getMonth() + 1)).slice(-2);

        var yyyy = dateOfToday.getFullYear();



        dateOfToday = yyyy + '-' + mm + '-' + dd;

        return dateOfToday;

    }

function PopulateEndDate() {

        var d2;

        var paymentDays;

        var stDate;

        var pDate;

    

        if (document.getElementById("startDate"))

            stDate = document.getElementById("startDate").value;

        if (document.getElementById("presentDate"))

            pDate = document.getElementById("presentDate").value;

            

        var futureSDate =  (pDate < stDate); //future start date

        var pastSDate = (pDate > stDate); //start date was in the past

        var sameDates = (pDate == stDate);

        

        if (stDate && futureSDate)

            d2 = new Date(stDate);

        else if (stDate && sameDates)

            d2 = new Date(stDate);

        else if (stDate && pastSDate)

            d2 = new Date(pDate);

        else

            d2 = new Date(pDate);

            

        var dd = d2.getDate()+1000;

        var mm = d2.getMonth()+1;

        var yyyy = d2.getFullYear();

        var today = (mm+'/'+dd+'/'+yyyy);



     

        paymentDays = document.getElementById("paymentRemaining").value;

            

        if (paymentDays)

        var n = d2.getDate();

        d2.setDate(1);

        d2.setMonth(d2.getMonth() + parseInt(paymentDays));

        d2.setDate(Math.min(n, getDaysInMonth(d2.getFullYear(), d2.getMonth())));

        if (document.getElementById("endDate"))

            document.getElementById("endDate").value = getCurrentDay(d2);

    }

<label>Start of Lease </label> <input  id="startDate"  onchange="PopulateEndDate()" type="date" ><br/><br/>

<label>Present date </label> <input  id="presentDate" onchange="PopulateEndDate()"  type="date" ><br/><br/>

<label>Remaining Payments</label> <input id="paymentRemaining" name = "paymentRemaining" type="number" class="label1" style="text-align: right; width:80px;"> <br/><br/>

<label>End of Lease </label> <input  id="endDate"  onchange="PopulateEndDate()" type="date" ><br/><br/><br/>

But, it should be on 10/8/2019. Any help is appreciated. Thank you.

asked Nov 14 '18 at 19:11

ace23

5811

Using a date library like moment.js would help you simplify the logic for something like this

– charlietfl
Nov 14 '18 at 19:15

add a comment |

I have 3 dates: Present date:11/14/2018, Start of lease date: 11/8/2014 and End of lease date
and the remaining payments which is 10 payments from Present date.

Present date is always today's date. Start of lease can be anything but I am working on if the start of lease was in the past.

Based on this i have the following cash flow:

enter image description here

Since the lease started on the 8th, the payments will be on 8th of every month.
I have the following code that parses number of days depending on when the start date is.

    function isLeapYear(year) {

        return (((year % 4 === 0) && (year % 100 !== 0)) || (year % 400 === 0));

    }

    function getDaysInMonth(year, month) {

        return [31, (isLeapYear(year) ? 29 : 28), 31, 30, 31, 30, 31, 31, 30, 31, 30, 31][month];

    }

     function getCurrentDay(date) {

        var dateOfToday;

        if(date && date != "")

            dateOfToday = new Date(date);

        else dateOfToday = new Date();



        var dd = ("0" + (dateOfToday.getDate())).slice(-2);

        var mm = ("0" + (dateOfToday.getMonth() + 1)).slice(-2);

        var yyyy = dateOfToday.getFullYear();



        dateOfToday = yyyy + '-' + mm + '-' + dd;

        return dateOfToday;

    }

function PopulateEndDate() {

        var d2;

        var paymentDays;

        var stDate;

        var pDate;

    

        if (document.getElementById("startDate"))

            stDate = document.getElementById("startDate").value;

        if (document.getElementById("presentDate"))

            pDate = document.getElementById("presentDate").value;

            

        var futureSDate =  (pDate < stDate); //future start date

        var pastSDate = (pDate > stDate); //start date was in the past

        var sameDates = (pDate == stDate);

        

        if (stDate && futureSDate)

            d2 = new Date(stDate);

        else if (stDate && sameDates)

            d2 = new Date(stDate);

        else if (stDate && pastSDate)

            d2 = new Date(pDate);

        else

            d2 = new Date(pDate);

            

        var dd = d2.getDate()+1000;

        var mm = d2.getMonth()+1;

        var yyyy = d2.getFullYear();

        var today = (mm+'/'+dd+'/'+yyyy);



     

        paymentDays = document.getElementById("paymentRemaining").value;

            

        if (paymentDays)

        var n = d2.getDate();

        d2.setDate(1);

        d2.setMonth(d2.getMonth() + parseInt(paymentDays));

        d2.setDate(Math.min(n, getDaysInMonth(d2.getFullYear(), d2.getMonth())));

        if (document.getElementById("endDate"))

            document.getElementById("endDate").value = getCurrentDay(d2);

    }

<label>Start of Lease </label> <input  id="startDate"  onchange="PopulateEndDate()" type="date" ><br/><br/>

<label>Present date </label> <input  id="presentDate" onchange="PopulateEndDate()"  type="date" ><br/><br/>

<label>Remaining Payments</label> <input id="paymentRemaining" name = "paymentRemaining" type="number" class="label1" style="text-align: right; width:80px;"> <br/><br/>

<label>End of Lease </label> <input  id="endDate"  onchange="PopulateEndDate()" type="date" ><br/><br/><br/>

But, it should be on 10/8/2019. Any help is appreciated. Thank you.

asked Nov 14 '18 at 19:11

ace23

5811

I have 3 dates: Present date:11/14/2018, Start of lease date: 11/8/2014 and End of lease date
and the remaining payments which is 10 payments from Present date.

Present date is always today's date. Start of lease can be anything but I am working on if the start of lease was in the past.

Based on this i have the following cash flow:

enter image description here

Since the lease started on the 8th, the payments will be on 8th of every month.
I have the following code that parses number of days depending on when the start date is.

    function isLeapYear(year) {

        return (((year % 4 === 0) && (year % 100 !== 0)) || (year % 400 === 0));

    }

    function getDaysInMonth(year, month) {

        return [31, (isLeapYear(year) ? 29 : 28), 31, 30, 31, 30, 31, 31, 30, 31, 30, 31][month];

    }

     function getCurrentDay(date) {

        var dateOfToday;

        if(date && date != "")

            dateOfToday = new Date(date);

        else dateOfToday = new Date();



        var dd = ("0" + (dateOfToday.getDate())).slice(-2);

        var mm = ("0" + (dateOfToday.getMonth() + 1)).slice(-2);

        var yyyy = dateOfToday.getFullYear();



        dateOfToday = yyyy + '-' + mm + '-' + dd;

        return dateOfToday;

    }

function PopulateEndDate() {

        var d2;

        var paymentDays;

        var stDate;

        var pDate;

    

        if (document.getElementById("startDate"))

            stDate = document.getElementById("startDate").value;

        if (document.getElementById("presentDate"))

            pDate = document.getElementById("presentDate").value;

            

        var futureSDate =  (pDate < stDate); //future start date

        var pastSDate = (pDate > stDate); //start date was in the past

        var sameDates = (pDate == stDate);

        

        if (stDate && futureSDate)

            d2 = new Date(stDate);

        else if (stDate && sameDates)

            d2 = new Date(stDate);

        else if (stDate && pastSDate)

            d2 = new Date(pDate);

        else

            d2 = new Date(pDate);

            

        var dd = d2.getDate()+1000;

        var mm = d2.getMonth()+1;

        var yyyy = d2.getFullYear();

        var today = (mm+'/'+dd+'/'+yyyy);



     

        paymentDays = document.getElementById("paymentRemaining").value;

            

        if (paymentDays)

        var n = d2.getDate();

        d2.setDate(1);

        d2.setMonth(d2.getMonth() + parseInt(paymentDays));

        d2.setDate(Math.min(n, getDaysInMonth(d2.getFullYear(), d2.getMonth())));

        if (document.getElementById("endDate"))

            document.getElementById("endDate").value = getCurrentDay(d2);

    }

<label>Start of Lease </label> <input  id="startDate"  onchange="PopulateEndDate()" type="date" ><br/><br/>

<label>Present date </label> <input  id="presentDate" onchange="PopulateEndDate()"  type="date" ><br/><br/>

<label>Remaining Payments</label> <input id="paymentRemaining" name = "paymentRemaining" type="number" class="label1" style="text-align: right; width:80px;"> <br/><br/>

<label>End of Lease </label> <input  id="endDate"  onchange="PopulateEndDate()" type="date" ><br/><br/><br/>

But, it should be on 10/8/2019. Any help is appreciated. Thank you.

    function isLeapYear(year) {

        return (((year % 4 === 0) && (year % 100 !== 0)) || (year % 400 === 0));

    }

    function getDaysInMonth(year, month) {

        return [31, (isLeapYear(year) ? 29 : 28), 31, 30, 31, 30, 31, 31, 30, 31, 30, 31][month];

    }

     function getCurrentDay(date) {

        var dateOfToday;

        if(date && date != "")

            dateOfToday = new Date(date);

        else dateOfToday = new Date();



        var dd = ("0" + (dateOfToday.getDate())).slice(-2);

        var mm = ("0" + (dateOfToday.getMonth() + 1)).slice(-2);

        var yyyy = dateOfToday.getFullYear();



        dateOfToday = yyyy + '-' + mm + '-' + dd;

        return dateOfToday;

    }

function PopulateEndDate() {

        var d2;

        var paymentDays;

        var stDate;

        var pDate;

    

        if (document.getElementById("startDate"))

            stDate = document.getElementById("startDate").value;

        if (document.getElementById("presentDate"))

            pDate = document.getElementById("presentDate").value;

            

        var futureSDate =  (pDate < stDate); //future start date

        var pastSDate = (pDate > stDate); //start date was in the past

        var sameDates = (pDate == stDate);

        

        if (stDate && futureSDate)

            d2 = new Date(stDate);

        else if (stDate && sameDates)

            d2 = new Date(stDate);

        else if (stDate && pastSDate)

            d2 = new Date(pDate);

        else

            d2 = new Date(pDate);

            

        var dd = d2.getDate()+1000;

        var mm = d2.getMonth()+1;

        var yyyy = d2.getFullYear();

        var today = (mm+'/'+dd+'/'+yyyy);



     

        paymentDays = document.getElementById("paymentRemaining").value;

            

        if (paymentDays)

        var n = d2.getDate();

        d2.setDate(1);

        d2.setMonth(d2.getMonth() + parseInt(paymentDays));

        d2.setDate(Math.min(n, getDaysInMonth(d2.getFullYear(), d2.getMonth())));

        if (document.getElementById("endDate"))

            document.getElementById("endDate").value = getCurrentDay(d2);

    }

<label>Start of Lease </label> <input  id="startDate"  onchange="PopulateEndDate()" type="date" ><br/><br/>

<label>Present date </label> <input  id="presentDate" onchange="PopulateEndDate()"  type="date" ><br/><br/>

<label>Remaining Payments</label> <input id="paymentRemaining" name = "paymentRemaining" type="number" class="label1" style="text-align: right; width:80px;"> <br/><br/>

<label>End of Lease </label> <input  id="endDate"  onchange="PopulateEndDate()" type="date" ><br/><br/><br/>

    function isLeapYear(year) {

        return (((year % 4 === 0) && (year % 100 !== 0)) || (year % 400 === 0));

    }

    function getDaysInMonth(year, month) {

        return [31, (isLeapYear(year) ? 29 : 28), 31, 30, 31, 30, 31, 31, 30, 31, 30, 31][month];

    }

     function getCurrentDay(date) {

        var dateOfToday;

        if(date && date != "")

            dateOfToday = new Date(date);

        else dateOfToday = new Date();



        var dd = ("0" + (dateOfToday.getDate())).slice(-2);

        var mm = ("0" + (dateOfToday.getMonth() + 1)).slice(-2);

        var yyyy = dateOfToday.getFullYear();



        dateOfToday = yyyy + '-' + mm + '-' + dd;

        return dateOfToday;

    }

function PopulateEndDate() {

        var d2;

        var paymentDays;

        var stDate;

        var pDate;

    

        if (document.getElementById("startDate"))

            stDate = document.getElementById("startDate").value;

        if (document.getElementById("presentDate"))

            pDate = document.getElementById("presentDate").value;

            

        var futureSDate =  (pDate < stDate); //future start date

        var pastSDate = (pDate > stDate); //start date was in the past

        var sameDates = (pDate == stDate);

        

        if (stDate && futureSDate)

            d2 = new Date(stDate);

        else if (stDate && sameDates)

            d2 = new Date(stDate);

        else if (stDate && pastSDate)

            d2 = new Date(pDate);

        else

            d2 = new Date(pDate);

            

        var dd = d2.getDate()+1000;

        var mm = d2.getMonth()+1;

        var yyyy = d2.getFullYear();

        var today = (mm+'/'+dd+'/'+yyyy);



     

        paymentDays = document.getElementById("paymentRemaining").value;

            

        if (paymentDays)

        var n = d2.getDate();

        d2.setDate(1);

        d2.setMonth(d2.getMonth() + parseInt(paymentDays));

        d2.setDate(Math.min(n, getDaysInMonth(d2.getFullYear(), d2.getMonth())));

        if (document.getElementById("endDate"))

            document.getElementById("endDate").value = getCurrentDay(d2);

    }

<label>Start of Lease </label> <input  id="startDate"  onchange="PopulateEndDate()" type="date" ><br/><br/>

<label>Present date </label> <input  id="presentDate" onchange="PopulateEndDate()"  type="date" ><br/><br/>

<label>Remaining Payments</label> <input id="paymentRemaining" name = "paymentRemaining" type="number" class="label1" style="text-align: right; width:80px;"> <br/><br/>

<label>End of Lease </label> <input  id="endDate"  onchange="PopulateEndDate()" type="date" ><br/><br/><br/>

javascript

asked Nov 14 '18 at 19:11

ace23

5811

asked Nov 14 '18 at 19:11

ace23

5811

asked Nov 14 '18 at 19:11

ace23

5811

asked Nov 14 '18 at 19:11

ace23

5811

asked Nov 14 '18 at 19:11

ace23

5811

Using a date library like moment.js would help you simplify the logic for something like this

– charlietfl
Nov 14 '18 at 19:15

add a comment |

Using a date library like moment.js would help you simplify the logic for something like this

– charlietfl
Nov 14 '18 at 19:15

Using a date library like moment.js would help you simplify the logic for something like this

– charlietfl
Nov 14 '18 at 19:15

add a comment |

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