javascript - Add, subtract and compare date and time on Meteor Mongo -

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i running collection on meteor mongo has field called last_activity , 1 called expire_date.

in particular case need items collection last_activity n hours ago.

in second case have save expire_date n months creation time (right now).

how can add or subtract date or time on mongo/meteor (if use different methods glad if explained both briefly) , make comparisons them?

plus, 1 best idea choose when getting database? save processing time if directly on mongo?

it depends on how store date. have @ least 2 options.

date.now() 1437215759517

or

new date() date 2015-07-18t10:36:04.981z

in first case amount of ms special point of time in linux(unix) world :d , can add time existing one. example:

1 week 7 * 1 days 7 * 24 hours 7 * 24 * 60 minutes 7 * 24 * 60 * 60 seconds 7 * 24 * 60 * 60 * 1000 ms

so in code have (1 week now):

expire_date = date.now() + 7 * (24 * 60 * 60 * 1000)

and yes. display date in eye-pleasing format suggest moment.js

date.now() 1437216383841  moment(date.now()).format('ll') "july 18, 2015"  moment(date.now() + 7 * (24 * 60 * 60 * 1000)).fromnow() "in 7 days"

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