<time>

The <time> CSS data type denotes time dimensions expressed in seconds or milliseconds. They consists of a​ ​​​​​​<number> immediately followed by the unit. Like for any CSS dimension, there is no space between the unit literal and the number.

The following units may be used :

• s which represents a time in seconds. E.g. 0s, 1.5s, -60s.
• ms which represents a time in milliseconds. E.g. 0ms, 1500ms, -60000ms.

Conversion between s and ms follows the logical 1s = 1000ms.

Even if all units represent the same time for the value 0, the unit may not be omitted in that case as it isn't a <length>: 0 is invalid and does not represent 0s, 0ms.

Examples

These are valid time values:

12s         Positive integer
-456ms      Negative integer
4.3ms       Non-integer
14mS        The unit is case-insensitive, though capital letters are not recommended for s and ms.
+0s         Zero, with a leading + and the unit
-0ms        Zero, with a leading - and the unit (Though strange, this is an allowed value)

These are invalid time values:

0           While unitless zero is allowed for <length>, it's invalid for all other units.
12.0        This is a <number>, not a <time>, it must have a unit
7 ms        No space is allowed between the <number> and the unit

Specifications

Specification	Status	Comment
CSS Values and Units Module Level 3 The definition of '<time>' in that specification.	Candidate Recommendation	Normatively defined s and ms
CSS Level 2 (Revision 1) The definition of '<time>' in that specification.	Recommendation	Informatively defined s and ms

Browser compatibility