Template talk:JULIANDAY
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The formula used is in this template is :
(((year * 12 + month + 57608.5 round 0) / 12 - 1.5 round 0) * 1461 / 4 - 0.5 round 0) - (((year * 12 + month + 57608.5 round 0) / 12 - 1.5 round 0) / 100 - 0.5 round 0) + (((year * 12 + month + 57608.5 round 0) / 12 - 1.5 round 0) / 400 - 0.5 round 0) + (( (month + 57608.5 round 0) mod 12 + 4) * 153 / 5 - 0.5 round 0) + day + hour / 24 + minute / 1440 + second / 86400 - 32167.5
The formulas allows using date elements that are out of range, for date computing (for example when adding or substracting any number of months, and it works even if these months span one or more leap years). You can also specify hours out of the normal range 0..23, minutes seconds out of 0..59. And days of month out of the normal month range (1..31), so you can also add or substract any number of days. It ignores leap seconds (the returned JD considers all days having 24 hours exactly).
[edit] Testing subst
Optional substitution works if all optional parameters are specified, and the optional subst parameter is given as in:
{{subst:JULIANDAY|2006|12|31|23|59|59|subst=subst:}} = 2454101.49999
Without substitution:
{{JULIANDAY|2006|12|31|23|59|59}} = 2454101.4999884
[edit] Test suite
- Adapted from m:Template talk:YMD2MJD
| Code | Result | MJD | JD | REXX |
|---|---|---|---|---|
| {{JULIANDAY|0000|03|01|0}} = | 1721119.5 | -678881 | 1721119.5 | -306 |
| {{JULIANDAY|0001|01|31|0}} = | 1721455.5 | -678545 | 1721455.5 | 30 |
| {{JULIANDAY|0001|02|01|0}} = | 1721456.5 | -678544 | 1721456.5 | 31 |
| {{JULIANDAY|0001|02|28|0}} = | 1721483.5 | -678517 | 1721483.5 | 58 |
| {{JULIANDAY|0001|03|01|0}} = | 1721484.5 | -678516 | 1721484.5 | 59 |
| {{JULIANDAY|0001|08|31|0}} = | 1721667.5 | -678333 | 1721667.5 | 242 |
| {{JULIANDAY|0001|09|01|0}} = | 1721668.5 | -678332 | 1721668.5 | 243 |
| {{JULIANDAY|0004|02|29|0}} = | 1722579.5 | -677421 | 1722579.5 | 1154 |
| {{JULIANDAY|0004|03|01|0}} = | 1722580.5 | -677420 | 1722580.5 | 1155 |
| {{JULIANDAY|1259|03|02|0}} = | 2180960.5 | -219040 | 2180960.5 | 459535 |
| {{JULIANDAY|1516|12|30|0}} = | 2275130.5 | -124870 | 2275130.5 | 553705 |
| {{JULIANDAY|1582|10|15|0}} = | 2299160.5 | -100840 | 2299160.5 | 577735 |
| {{JULIANDAY|1752|09|14|0}} = | 2361221.5 | -38779 | 2361221.5 | 639796 |
| {{JULIANDAY|1858|11|17|0}} = | 2400000.5 | 0 | 2400000.5 | 678575 |
| {{JULIANDAY|1895|02|28|0}} = | 2413252.5 | 13252 | 2413252.5 | 691827 |
| {{JULIANDAY|1895|03|01|0}} = | 2413253.5 | 13253 | 2413253.5 | 691828 |
| {{JULIANDAY|1896|02|29|0}} = | 2413618.5 | 13618 | 2413618.5 | 692193 |
| {{JULIANDAY|1896|03|01|0}} = | 2413619.5 | 13619 | 2413619.5 | 692194 |
| {{JULIANDAY|1900|02|28|0}} = | 2415078.5 | 15078 | 2415078.5 | 693653 |
| {{JULIANDAY|1900|03|01|0}} = | 2415079.5 | 15079 | 2415079.5 | 693654 |
| {{JULIANDAY|1970|01|01|0}} = | 2440587.5 | 40587 | 2440587.5 | 719162 |
| {{JULIANDAY|2000|02|29|0}} = | 2451603.5 | 51603 | 2451603.5 | 730178 |
| {{JULIANDAY|2000|03|01|0}} = | 2451604.5 | 51604 | 2451604.5 | 730179 |
| {{JULIANDAY|2738|11|28|0}} = | 2721424.5 | 321424 | 2721424.5 | 999999 |
- Examples adapted from on Meta:
- {{JULIANDAY|1900|02|28}} = 2415079, last day of February 1900
- {{JULIANDAY|1900|02|29}} = 2415080, bogey but okay
- {{JULIANDAY|1900|03|01}} = 2415080, no leap year
- {{JULIANDAY|1900|02|30}} = 2415081, bogey but okay
- {{JULIANDAY|1900|03|02}} = 2415081
- {{JULIANDAY|2000|02|29}} = 2451604, last day of February 2000
- {{JULIANDAY|2000|02|30}} = 2451605, bogey but okay
- {{JULIANDAY|2000|03|01}} = 2451605, leap year
- {{JULIANDAY|2000|02|31}} = 2451606, bogey but okay
- {{JULIANDAY|2000|03|02}} = 2451606
- {{JULIANDAY|2008|06|08}} = 2454626
[edit] Better examples
Where do I go to get the current day of the year? Like is today the 108th day of 2008 or what? --Uncle Ed (talk) 17:27, 17 April 2008 (UTC)
