> x
[1] 1399003199 1399089599 1399175999 1399262399 1399348799
[6] 1399435199 1399521599
> y
[1]  50  63 120  55  60  63  52
> lm(y ~ x)

Call:
lm(formula = y ~ x)

Coefficients:
(Intercept)            x  
  3.130e+04   -2.232e-05

> m <- lm(y ~ x)
> summary(m)

Call:
lm(formula = y ~ x)

Residuals:
       1        2        3        4        5        6        7 
-21.9286  -7.0000  51.9286 -11.1429  -4.2143   0.7143  -8.3571 

Coefficients:
              Estimate Std. Error t value Pr(>|t|)
(Intercept)  3.130e+04  8.026e+04   0.390    0.713
x           -2.232e-05  5.736e-05  -0.389    0.713

Residual standard error: 26.22 on 5 degrees of freedom
Multiple R-squared:  0.0294,	Adjusted R-squared:  -0.1647 
F-statistic: 0.1514 on 1 and 5 DF,  p-value: 0.7132