Parse Date, Time and Date/Time Strings

Note: If you have only a time string, check out the Parse Time String snippet.

Function ParseDateStringAlpha(str)
    String str          // Format: ddmmmyyyy hh:mm:ss.xx
   
    Variable day, month, year, hour, minute, second, fraction
    String monthStr
   
    sscanf str, "%2d%3s%4d %d:%d:%d.%d", day, monthStr, year, hour, minute, second, fraction
   
    // For debugging only.
    // Print day, monthStr, year, hour, minute, second, fraction
   
    // This should be broken out into a subroutine for cleanliness.
    strswitch(monthStr)
        case "jan":
            month=1
            break
        case "feb":
            month=2
            break
        case "mar":
            month=3
            break
        case "apr":
            month=4
            break
        case "may":
            month=5
            break
        case "jun":
            month=6
            break
        case "jul":
            month=7
            break
        case "aug":
            month=8
            break
        case "sep":
            month=9
            break
        case "oct":
            month=10
            break
        case "nov":
            month=11
            break
        case "dec":
            month=12
            break
    endswitch

    Variable dt         // Igor date/time format.
    dt = date2secs(year, month, day)
    dt += 3600*hour + 60*minute + second + fraction
    return dt
End

//  ParseDateStringUSNumeric(str)
//  Returns seconds since 1/1/1904
Function ParseDateStringUSNumeric(str)
    String str          // Format: "mm/dd/yy hh:mm:ss" or "mm/dd/yyyy hh:mm:ss" (preferred)
   
    Variable day, month, year, hour, minute, second
   
    // Do a trial run to determine if four digit year is used.
    Variable fourDigitYear
    sscanf str, "%2d/%2d/%d", month, day, year
    fourDigitYear = year > 99
   
    // sscanf requires Igor Pro 4 or later.
    if (fourDigitYear)
        sscanf str, "%2d/%2d/%4d %d:%d:%d", month, day, year, hour, minute, second
    else
        sscanf str, "%2d/%2d/%2d %d:%d:%d", month, day, year, hour, minute, second
        year += 2000            // Assume this century.
    endif
   
    // For debugging only.
    // Print month, day, year, hour, minute, second
   
    Variable dt         // Igor date/time format.
    dt = date2secs(year, month, day)
    dt += 3600*hour + 60*minute + second
    return dt
End

//  ParseTimeString(str)
//  Returns seconds. Time string format is assumed to be hh:mm or hh:mm:ss.
Function ParseTimeString(str)
    String str          // Format: "hh:mm" or "hh:mm:ss"
   
    Variable hour, minute, second
   
    // sscanf requires Igor Pro 4 or later.
    sscanf str, "%d:%d:%d", hour, minute, second
    if (V_flag == 2)
        second = 0
    endif
   
    // For debugging only.
    // Print hour, minute, second
   
    Variable dt         // Igor date/time format.
    dt = 3600*hour + 60*minute + second
    return dt
End


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