Same date returns for last or first weekday of a given month

[CodeSnooker]

For example,

Use
Date.create('first Thursday of next month')
or
Date.create('last Thursday of next month')

Both of them returns same date. As of now it returns 'Thu Jul 04 2019 23:59:59 GMT+0530 (India Standard Time)'

Expected result
last Thursday of next month should returns 'Thu Jul 25 2019 23:59:59 GMT +0530 (India Standard Time)'

[andrewplummer]

Thanks for letting me know about this! I'll have a look.