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I´ve just noticed this thread - so, I can add some information. Forensic Entomology works with so called "lover development threshold", "sum of effective temperatures to develop from egg to puparium" and "heat constant of species = sum of effective temperatures to develop from egg to adult". So, if you know these rates (numbers) you can keep count of time (days).

Call.vicina: LDT 2 °C, SET to pupa 191, SET to adult 388;
Call.vomitoria: LDT 3, SET to pupa 213, SET to adult 472;
Luc.sericata: LDT 9, SET to pupa ?, SET to adult 207;
Chrys.albiceps: LDT 10.2, SET to pupa 123, SET to adult 186;
Phorm.regina: LDT 11.4, SET to pupa 101, SET to adult 148;
Musc.stabulans: LDT 7.2, SET to pupa 139, SET to adult 269;

And now - how does it work? Simply ;)
The forensic entomologists take samples of alive larvae (maggots) from a body and "breed" them on piece of meat (in using constant temperature, usually 20-24 °C) until pupation or more precisely until adults. It is less difficult to determine adults to species ;)
Then you know spesies and "rates" of the species and you can count off average day temperature all days before hatching of adults (or pupation).

Hana