Template talk:Dectime

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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.

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|08|36|24}} = 0.35861111111111
{{dectime}} = 0.35861111111111
Default time hh:00:00 if hours hh specified, otherwise the current time is extracted from {{CURRENTTIMESTAMP}} gives 20191022083624  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:}}.