Date-Related Helper Methods

[ihcsim]

Hi Michael,

I've added some date-related helper methods. If you deem these as useful additions, feel free to merge them into the project:

DateHelper.strToDate() // convert string to date
DateHelper.dateToStr() // convert date to string
DateHelper.todayDate() // get today's date
DateHelper.yesterdayDate() // get yesterday's date
DateHelper.tomorrowDate() // get tomorrow's date
DateHelper.applyPattern() // change the date pattern

Thanks.

[MichaelKohler]

That looks awesome, pretty nice idea! Would you mind fixing the 3 nits above in a new commit? Then I will merge this 👍

[ihcsim]

Done. I shouldn't need to create a new pull request, right? I'm still new to this stuff. Thanks, Michael for sharing the codes. Have a good weekend.

[MichaelKohler]

Awesome, I will merge it right away. Thanks!