Fix date value in timestamp

[seri530]

The date.getMonth() returns with a value between 0 and 11 (e.g.: January == 0). To display the correct date, you should add 1 to that.

Ref: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Date/getMonth

[coveralls]

Coverage remained the same at 99.099% when pulling ec3f6b0 on seri530:master into e91659d on Upplication:master.

[coveralls]

Coverage remained the same at 99.099% when pulling ec3f6b0 on seri530:master into e91659d on Upplication:master.

[coveralls]

Coverage remained the same at 99.099% when pulling ec3f6b0 on seri530:master into e91659d on Upplication:master.