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.TH gettidiff
.SH NAME 
.B gettidiff - get the difference (in hours) between two dates
.SH SYNOPSIS 
.B gettidiff
.I date1 
.I date2
.SH DESCRIPTION
Get the time difference (in hours) between two dates ( in form YYYYMMDD_HH(MM), i.e. the minutes are optional): date1 - date2. The output is in format HH or HH.MM
.SH PARAMETERS
.TP 15
.B date1 
first date ( in form YYYYMMDD_HH(MM) )
.TP 15
.B date2 
second date ( in form YYYYMMDD_HH(MM) )
.SH EXAMPLES
.TP 5
.B  [1] gettidiff 20110102_18 20110205_00
gives the time difference between 20110102_18 and 20110205_00; the result is -798 h.
.SH AUTHOR
Written by Michael Sprenger and Heini Wernli (January 2011)