Defaulting date to first day of the month (Syclo Agentry Workmanager 6.2)

Hi experts,

I am working on Workmanager 6.2.

While adding labour time, I want to set the default date as the first day of the current month in date field. (for eg. for the month of January, it should be 1/1/2016).

I tried adding a rule in the initial value but it's not working.

There are two rules that I tried, but it's not working.

1.

The logic I tried is hard coding day to 01 and then concatenating it with System month and year.

2.

The logic I tried was ----   System Date - (System Date - 1 day)

Please help me on this.

Regards,

Bino