Using Loop to Search through Time Stamps with sprintf

I am trying to set up a loop that uses a matrix, x, with values from 1 through 30 to search through a cell of timestamps and eturns the indecies of each day. For example, a value of 20 from matrix x is placed into the format 1/x/2009 and searches through a matrix time_stamps and returns indecies of 1 to 1020.

Here's what I have so far for x=Date_List g=sprintf(' 1/%d/2009 ',x) ind=strmatch({'g'},time_stamps) end I have a few problems. g outputs as a 1x343 single character of dates and then I also don't know what format to put g into the strmatch function.

For a single date its just

ind=strmatch({'1/20/2009'},time_stamps)

and that works fine.