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Try with the original time format in post#1:
awk -F: '{m=$1*60+$2+$3/60; d=(m-p)} d<0{d+=1440} NR>1{printf "%.0f\n", d} {p=m}' file

If the difference is negative it is assumed there is one day...

Assuming you have only one file created everyday
file=file.txt.$(date +%Y%m%d)*
test -f $file && mv "$file" "${file/./_first.}"

--ahamed

if test -f file.txt.$(date +%Y%m%d)*; then
echo Found!
fi


Example:

$ touch file.txt.$(date +%Y%m%d%H%M%S)

$ ls file.txt*
file.txt.20130925030644

$ if test...

You should be OK using: file.txt.$(date +%Y%m%d)*

awk '/tea/' RS= FS="\n" yourfile

or

awk '/tea/' RS= FS="\n" ORS="\n\n" yourfile