System.Data.SQLite
Check-in [fe17cded54]
Not logged in

Many hyperlinks are disabled.
Use anonymous login to enable hyperlinks.

Overview
Comment:Add experimental port of the Julian Day handling functions from the SQLite core library. Still needs tests. Pursuant to [3e783eecbe].
Downloads: Tarball | ZIP archive | SQL archive
Timelines: family | ancestors | descendants | both | newJulianDay
Files: files | file ages | folders
SHA1: fe17cded54f1faf8fcc52ece5aae977ca40996e7
User & Date: mistachkin 2014-10-31 21:36:38
Context
2014-10-31
22:40
Improve handling of out-of-range Julian Day values. check-in: c559792dba user: mistachkin tags: newJulianDay
21:36
Add experimental port of the Julian Day handling functions from the SQLite core library. Still needs tests. Pursuant to [3e783eecbe]. check-in: fe17cded54 user: mistachkin tags: newJulianDay
2014-10-30
01:12
Update SQLite core library to the 3.8.7.1 release. check-in: 5074b140f0 user: mistachkin tags: trunk
Changes
Hide Diffs Unified Diffs Ignore Whitespace Patch

Changes to System.Data.SQLite/SQLiteConvert.cs.

202
203
204
205
206
207
208







































































































































209
210
211
212
213
214
215
      return _utf8.GetString(byteArray, 0, nativestringlen);
    }


    #endregion

    #region DateTime Conversion Functions







































































































































    /// <summary>
    /// Converts a string into a DateTime, using the DateTimeFormat, DateTimeKind,
    /// and DateTimeFormatString specified for the connection when it was opened.
    /// </summary>
    /// <remarks>
    /// Acceptable ISO8601 DateTime formats are:
    /// <list type="bullet">







>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>







202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
      return _utf8.GetString(byteArray, 0, nativestringlen);
    }


    #endregion

    #region DateTime Conversion Functions
    #region New Julian Day Conversion Methods
    /// <summary>
    /// Converts a Julian Day number to a <see cref="DateTime" />.
    /// This function was copied from the "date.c" file belonging
    /// to the SQLite core library.
    /// </summary>
    /// <param name="jd">
    /// The Julian Day number to convert.
    /// </param>
    /// <returns>
    /// A <see cref="DateTime" /> value that contains the year, month, and day
    /// values that are closest to the specified Julian Day value.
    /// </returns>
    private static DateTime computeYMD(
        long jd
        )
    {
        int Z, A, B, C, D, E, X1;

        Z = (int)((jd + 43200000) / 86400000);
        A = (int)((Z - 1867216.25) / 36524.25);
        A = Z + 1 + A - (A / 4);
        B = A + 1524;
        C = (int)((B - 122.1) / 365.25);
        D = (36525 * C) / 100;
        E = (int)((B - D) / 30.6001);
        X1 = (int)(30.6001 * E);

        int day, month, year;

        day = B - D - X1;
        month = E < 14 ? E - 1 : E - 13;
        year = month > 2 ? C - 4716 : C - 4715;

        return new DateTime(year, month, day);
    }

    ///////////////////////////////////////////////////////////////////////////

    /// <summary>
    /// Converts a Julian Day number to a <see cref="DateTime" />.
    /// This function was copied from the "date.c" file belonging
    /// to the SQLite core library.
    /// </summary>
    /// <param name="jd">
    /// The Julian Day number to convert.
    /// </param>
    /// <returns>
    /// A <see cref="DateTime" /> value that contains the hour, minute, and
    /// second values that are closest to the specified Julian Day value.
    /// </returns>
    private static DateTime computeHMS(
        long jd
        )
    {
        int s;

        s = (int)((jd + 43200000) % 86400000);

        double seconds;

        seconds = s / 1000.0;
        s = (int)seconds;
        seconds -= s;

        int hour;

        hour = s / 3600;
        s -= hour * 3600;

        int minute;

        minute = s / 60;
        seconds += s - minute * 60;

        int second = (int)Math.Truncate(seconds);
        int millisecond = (int)((seconds - second) * 1000.0);

        DateTime minValue = DateTime.MinValue;

        return new DateTime(
            minValue.Year, minValue.Month, minValue.Day,
            hour, minute, second, millisecond);
    }

    ///////////////////////////////////////////////////////////////////////////

    /// <summary>
    /// Converts a <see cref="DateTime" /> to a Julian Day number.
    /// This function was copied from the "date.c" file belonging
    /// to the SQLite core library.
    /// </summary>
    /// <param name="dateTime">
    /// The <see cref="DateTime" /> value to convert.
    /// </param>
    /// <returns>
    /// The nearest Julian Day number corresponding to the specified
    /// <see cref="DateTime" /> value.
    /// </returns>
    private static long computeJD(
        DateTime dateTime
        )
    {
        int Y, M, D;

        Y = dateTime.Year;
        M = dateTime.Month;
        D = dateTime.Day;

        if (M <= 2)
        {
            Y--;
            M += 12;
        }

        int A, B, X1, X2;

        A = Y / 100;
        B = 2 - A + (A / 4);
        X1 = 36525 * (Y + 4716) / 100;
        X2 = 306001 * (M + 1) / 10000;

        long jd;

        jd = (long)((X1 + X2 + D + B - 1524.5) * 86400000);

        jd += dateTime.Hour * 3600000 + dateTime.Minute *
            60000 + (long)(dateTime.Second * 1000);

        return jd;
    }
    #endregion

    ///////////////////////////////////////////////////////////////////////////

    /// <summary>
    /// Converts a string into a DateTime, using the DateTimeFormat, DateTimeKind,
    /// and DateTimeFormatString specified for the connection when it was opened.
    /// </summary>
    /// <remarks>
    /// Acceptable ISO8601 DateTime formats are:
    /// <list type="bullet">