Change all the values to zero for a certain period of time

[Jeon Joan]

Hello!
I'd like to get some advice.
I have the following forms of data.

I'd like to change all the "thrifty" values to zero for a certain period of time.
In the data below, for example, I would like to change all the values of thrift from 01apr2015 to 02apr2015.
If it goes as I intended, then "thrifty_nb" should be created.
(The thrift value is only 0 or 1)

Thanks!

* Example generated by -dataex-. To install: ssc install dataex
clear
input float(id date thrifty thrifty_nb)
1 20148 0 0
1 20149 0 0
1 20150 1 1
1 20179 1 0
1 20180 0 0
2 20149 0 0
2 20150 0 0
2 20151 1 1
2 20179 1 0
2 20180 1 0
2 20181 1 1
end
format %td date

[William Lisowski]

The following should do what you want. The td() function is documented in the output of help datetime in the section "Conveniently typing SIF values".

. generate wanted = thrifty

. replace wanted = 0 if inrange(date,td(01apr2015),td(02apr2015))
(3 real changes made)

. list, noobs sepby(id) abbreviate(12)

  +------------------------------------------------+
  | id        date   thrifty   thrifty_nb   wanted |
  |------------------------------------------------|
  |  1   01mar2015         0            0        0 |
  |  1   02mar2015         0            0        0 |
  |  1   03mar2015         1            1        1 |
  |  1   01apr2015         1            0        0 |
  |  1   02apr2015         0            0        0 |
  |------------------------------------------------|
  |  2   02mar2015         0            0        0 |
  |  2   03mar2015         0            0        0 |
  |  2   04mar2015         1            1        1 |
  |  2   01apr2015         1            0        0 |
  |  2   02apr2015         1            0        0 |
  |  2   03apr2015         1            1        1 |
  +------------------------------------------------+

[Jeon Joan]

Dear. William Lisowski

Thank you very much!
Thanks to you, I'm learning today, too!