How to convert a String to long in javascript?

javascript string long-integer unix-timestamp
Richard H picture Richard H · Mar 27, 2011 · Viewed 190.8k times · Source

I have a millisecond timestamp that I need to convert from a String to long. Javascript has a parseInt but not a parseLong. So how can I do this?

Thanks

Edit: To expand on my question slightly: given that apparently javascript doesn't have a long type, how can I do simple arithmetic with longs that are initially expressed as strings? E.g subtract one from the other to get a time delta?

Answer

Russ Cam picture Russ Cam · Mar 27, 2011

JavaScript has a Number type which is a 64 bit floating point number*.

If you're looking to convert a string to a number, use

  1. either parseInt or parseFloat. If using parseInt, I'd recommend always passing the radix too.
  2. use the Unary + operator e.g. +"123456"
  3. use the Number constructor e.g. var n = Number("12343")

*there are situations where the number will internally be held as an integer.

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