Template talk:Dectime

This the talk page for Template:Dectime and Template:MJD2HMS

Documentation

{{dectime}} converts times given as hh mm ss (hours, minutes, seconds) to decimal fractions of a day.

Usage

• {{dectime|hh|mm|ss}} converts hh:mm:ss
• {{dectime|hh|mm|00}} = {{dectime|hh|mm}}
• {{dectime|hh|00|00}} = {{dectime|hh}}
• {{dectime}} converts the current time incl. seconds

Examples

The following examples are usual times, but 00:00:00 up to 00:00:08 belong to the special cases shown below:

{{dectime|00|00|00}} = 0

{{dectime|00|00|01}} = 0.0000115740740741

{{dectime|00|00|08}} = 0.0000925925925926

{{dectime|00|00|09}} = 0.00010416666666667

{{dectime|00|22|30}} = 0.015625

{{dectime|00|45|00}} = 0.03125

{{dectime|01|30|00}} = 0.0625

{{dectime|03|00|00}} = 0.125

{{dectime|06|00|00}} = 0.25

{{dectime|12|00|00}} = 0.5

{{dectime|18|00|00}} = 0.75

{{dectime|21|00|00}} = 0.875

{{dectime|23|59|59}} = 0.99998842592593

{{dectime|23|59|60}} = 1

{{dectime|24|00|00}} = 1

{{dectime|24.00000}} = 1

{{dectime|19|08|00}} = 0.79722222222222

         {{dectime}} = 0.79722222222222

Default time hh:00:00 if hours hh specified, otherwise the current time is extracted from {{CURRENTTIMESTAMP}} gives 20240423190800 [1] using {{Timestamp2MJD}} to avoid critical races near hh:mm:59. The second to last example shown above might have this or another problem, it evaluates several "current" timestamps instead of one.

For {{dectime}} results between 0 and 1 excluding 1 {{MJD2HMS}} can be used as inverse function.

{{dectime|00|00|00}} = 0, {{MJD2HMS|0|||=}} gives 000000

{{dectime|00|00|01}} = 0.0000115740740741

{{MJD2HMS|0.0000115740740741}} = 00:00:01

{{dectime|23|59|59}} = 0.99998842592593

{{MJD2HMS|0.999988425926}} = 23:59:59

{{dectime|24|00|00}} = 1, {{MJD2HMS|1|||=}} gives 000000

Special cases

The special cases are based on  86400 = 24*60*60

1. Negative times are not supported:

   {{dectime|00|-01|+59}} = NegativeTimesNotSupported

2. Null is a (trivial) special case, accuracy is milliseconds (rounded):

   {{dectime|00|-01|+60}} = 0

   {{dectime|0|0|0.0004}} = 0

   {{dectime|0|0|0.0005}} = 0.0000000115740740741

3. Times before 00:00:00.009 (= 9 milliseconds) handled separately:

   {{dectime|0|0|0.0010}} = 0.0000000115740740741

   {{dectime|0|0|0.0080}} = 0.0000000925925925926

   {{dectime|0|0|0.0084}} = 0.0000000925925925926

4. Times before 00:00:00.087 (= 87 milliseconds), 12 significant digits:

   {{dectime|0|0|0.0085}} = 0.000000104166666667

   {{dectime|0|0|0.0860}} = 0.000000995370370370

   {{dectime|0|0|0.0864}} = 0.000000995370370370

5. Times before 00:00:00.864, all results are rounded:

   {{dectime|0|0|0.0865}} = 0.00000100694444444

   {{dectime|0|0|0.8630}} = 0.00000998842592593

   {{dectime|0|0|0.8634}} = 0.00000998842592593

6. Times before 00:00:08.640 (= 8640 milliseconds):

   {{dectime|0|0|0.8635}} = 0.0000100000000000

   {{dectime|0|0|8.6390}} = 0.0000999884259259

   {{dectime|0|0|8.6394}} = 0.0000999884259259

7. Normal handling starts at 00:00:08.640 (= 8640 milliseconds):

   {{dectime|0|0|8.6395}} = 0.0001

   {{dectime|0|0|8.6400}} = 0.0001

   {{dectime|0|0|86.399}} = 0.00099998842592593

   {{dectime|0|0|86.400}} = 0.001

   {{dectime|00|01|26.4}} = 0.001

8. Huge timestamps are shown in exponential format:

   {{dectime|23999999999987}} = 999999999999.46

   {{dectime|23999999999988}} = 999999999999.5

   {{dectime|24000000000000}} = 1000000000000

   {{dectime|36000000000000}} = 1500000000000

Note that trailing zeros are not truncated for times between 0 and 8640 milliseconds. Adding 0 or a similar operation would result in exponential format for input values below 8640 milliseconds.

The special handling is important for {{MJD}}={{YMD2MJD}}+{{dectime}}, some parser functions don't support input in exponential format.

Optional substitution works if all three parameters and subst=subst: are specified, or for the current time {{subst:dectime|subst=subst:}}.

See also

• template:Dectime (edit•talk•links•history)
• template:MJD2HMS (edit•talk•links•history)
• template:MJD (edit•talk•links•history)
• template:Sec2MJD (edit•talk•links•history)
• template:Timestamp2MJD (edit•talk•links•history)
• template:YMD2MJD (edit•talk•links•history)

Discussion

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