[javascript] calculate datetime

Calculate datetime 2 ways.

1 way will be calculate about YYYY-MM - YYYY-MM

function calMonthRange(val1, val2)

{

var FORMAT = "-";

if (val1.length != 7 || val2.length != 7)

return null;

if (val1.indexOf(FORMAT) < 0 || val2.indexOf(FORMAT) < 0)

return null;

var start_dt = val1.split(FORMAT);

var end_dt = val2.split(FORMAT);

start_dt[1] = (Number(start_dt[1]) - 1) + "";

end_dt[1] = (Number(end_dt[1]) - 1) + "";

var from_dt = new Date(start_dt[0], start_dt[1]);

var to_dt = new Date(end_dt[0], end_dt[1]);

return Math.ceil((to_dt.getTime() - from_dt.getTime()) / 1000 / 60 / 60 / 24 / 30);

}

calMonthRange("2017-08", "2018-04")

/*

Debugging output

*/

9

/*

1 way apply code

*/

function formatMonth(date) {

var d = new Date(date),

month = '' + (d.getMonth() + 1),

year = d.getFullYear();

if (month.length < 2) month = '0' + month;

return [year, month].join('-');

}

function calMonthRange(val1, val2)

{

var FORMAT = "-";

if (val1.length != 7 || val2.length != 7)

return null;

if (val1.indexOf(FORMAT) < 0 || val2.indexOf(FORMAT) < 0)

return null;

var start_dt = val1.split(FORMAT);

var end_dt = val2.split(FORMAT);

start_dt[1] = (Number(start_dt[1]) - 1) + "";

end_dt[1] = (Number(end_dt[1]) - 1) + "";

var from_dt = new Date(start_dt[0], start_dt[1]);

var to_dt = new Date(end_dt[0], end_dt[1]);

return Math.ceil((to_dt.getTime() - from_dt.getTime()) / 1000 / 60 / 60 / 24 / 30);

}

for(var i=0; i<calMonthRange("2017-08", "2018-04"); i++) {

    console.log(formatMonth(new Date("2017-08").setMonth(new Date("2017-08").getMonth() + i)))

}

/*

Debugging output

*/

2017-08

2017-09

2017-10

2017-11

2017-12

2018-01

2018-02

2018-03

2018-04

2 way will be calculate about YYYY-MM-DD - YYYY-MM-DD

function calDateRange(val1, val2)

{

var FORMAT = "-";

if (val1.length != 10 || val2.length != 10)

return null;

if (val1.indexOf(FORMAT) < 0 || val2.indexOf(FORMAT) < 0)

return null;

var start_dt = val1.split(FORMAT);

var end_dt = val2.split(FORMAT);

start_dt[1] = (Number(start_dt[1]) - 1) + "";

end_dt[1] = (Number(end_dt[1]) - 1) + "";

var from_dt = new Date(start_dt[0], start_dt[1], start_dt[2]);

var to_dt = new Date(end_dt[0], end_dt[1], end_dt[2]);

return (to_dt.getTime() - from_dt.getTime()) / 1000 / 60 / 60 / 24;

}

calDateRange("2018-03-22", "2018-04-24")

/*

Debugging output

*/

33

/*

2 way apply code

*/

function formatDate(date) {

var d = new Date(date),

month = '' + (d.getMonth() + 1),

day = '' + d.getDate(),

year = d.getFullYear();

if (month.length < 2) month = '0' + month;

if (day.length < 2) day = '0' + day;

return [year, month, day].join('-');

}

function calDateRange(val1, val2)

{

var FORMAT = "-";

if (val1.length != 10 || val2.length != 10)

return null;

if (val1.indexOf(FORMAT) < 0 || val2.indexOf(FORMAT) < 0)

return null;

var start_dt = val1.split(FORMAT);

var end_dt = val2.split(FORMAT);

start_dt[1] = (Number(start_dt[1]) - 1) + "";

end_dt[1] = (Number(end_dt[1]) - 1) + "";

var from_dt = new Date(start_dt[0], start_dt[1], start_dt[2]);

var to_dt = new Date(end_dt[0], end_dt[1], end_dt[2]);

return (to_dt.getTime() - from_dt.getTime()) / 1000 / 60 / 60 / 24;

}

for(var i=0; i<calDateRange("2018-03-22", "2018-04-24"); i++) {

console.log(formatDate(new Date("2018-03-22").setDate(new Date("2018-03-22").getDate() + i)))

}

/*

Debugging output

*/

2018-03-22

2018-03-23

2018-03-24

2018-03-25

2018-03-26

2018-03-27

2018-03-28

2018-03-29

2018-03-30

2018-03-31

2018-04-01

2018-04-02

2018-04-03

2018-04-04

2018-04-05

2018-04-06

2018-04-07

2018-04-08

2018-04-09

2018-04-10

2018-04-11

2018-04-12

2018-04-13

2018-04-14

2018-04-15

2018-04-16

2018-04-17

2018-04-18

2018-04-19

2018-04-20

2018-04-21

2018-04-22

2018-04-23